feat: Add Stock Items UI and update Supplier offerings

- Add Stock Items index page listing all stock items
- Add Stock Items edit page with supplier offerings management
- Update Suppliers edit page to manage offerings (select from stock
  items instead of material+length)
- Add Stock Items navigation link to sidebar

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CutList.Web/Components/Layout/NavMenu.razor

@@ -23,6 +23,11 @@
                 <span class="bi bi-box-nav-menu" aria-hidden="true"></span> Materials
             </NavLink>
         </div>
+        <div class="nav-item px-3">
+            <NavLink class="nav-link" href="stock">
+                <span class="bi bi-boxes-nav-menu" aria-hidden="true"></span> Stock Items
+            </NavLink>
+        </div>
         <div class="nav-item px-3">
             <NavLink class="nav-link" href="suppliers">
                 <span class="bi bi-building-nav-menu" aria-hidden="true"></span> Suppliers

CutList.Web/Components/Pages/Stock/Edit.razor

@@ -0,0 +1,371 @@
+@page "/stock/new"
+@page "/stock/{Id:int}"
+@inject StockItemService StockItemService
+@inject MaterialService MaterialService
+@inject SupplierService SupplierService
+@inject NavigationManager Navigation
+@using CutList.Core.Formatting
+
+<PageTitle>@(IsNew ? "Add Stock Item" : "Edit Stock Item")</PageTitle>
+
+<h1>@(IsNew ? "Add Stock Item" : $"{stockItem.Material?.DisplayName} - {ArchUnits.FormatFromInches((double)stockItem.LengthInches)}")</h1>
+
+@if (loading)
+{
+    <p><em>Loading...</em></p>
+}
+else
+{
+    <div class="row">
+        <div class="col-lg-6 mb-4">
+            <div class="card">
+                <div class="card-header">
+                    <h5 class="mb-0">Stock Item Details</h5>
+                </div>
+                <div class="card-body">
+                    <EditForm Model="stockItem" OnValidSubmit="SaveStockItemAsync">
+                        <DataAnnotationsValidator />
+
+                        <div class="mb-3">
+                            <label class="form-label">Material</label>
+                            <select class="form-select" @bind="stockItem.MaterialId" disabled="@(!IsNew)">
+                                <option value="0">-- Select Material --</option>
+                                @foreach (var material in materials)
+                                {
+                                    <option value="@material.Id">@material.DisplayName</option>
+                                }
+                            </select>
+                        </div>
+
+                        <div class="mb-3">
+                            <label class="form-label">Length</label>
+                            @if (IsNew)
+                            {
+                                <LengthInput @bind-Value="stockItem.LengthInches" />
+                            }
+                            else
+                            {
+                                <input type="text" class="form-control" value="@ArchUnits.FormatFromInches((double)stockItem.LengthInches)" readonly />
+                            }
+                        </div>
+
+                        <div class="mb-3">
+                            <label class="form-label">Name (optional)</label>
+                            <InputText class="form-control" @bind-Value="stockItem.Name" placeholder="Custom display name" />
+                        </div>
+
+                        @if (!string.IsNullOrEmpty(errorMessage))
+                        {
+                            <div class="alert alert-danger">@errorMessage</div>
+                        }
+
+                        <div class="d-flex gap-2">
+                            <button type="submit" class="btn btn-primary" disabled="@saving">
+                                @if (saving)
+                                {
+                                    <span class="spinner-border spinner-border-sm me-1"></span>
+                                }
+                                @(IsNew ? "Create Stock Item" : "Save Changes")
+                            </button>
+                            <a href="stock" class="btn btn-outline-secondary">@(IsNew ? "Cancel" : "Back to List")</a>
+                        </div>
+                    </EditForm>
+                </div>
+            </div>
+        </div>
+
+        @if (!IsNew)
+        {
+            <div class="col-lg-6">
+                <div class="card">
+                    <div class="card-header d-flex justify-content-between align-items-center">
+                        <h5 class="mb-0">Supplier Offerings</h5>
+                        <button class="btn btn-sm btn-primary" @onclick="ShowAddOfferingForm">Add Offering</button>
+                    </div>
+                    <div class="card-body">
+                        @if (showOfferingForm)
+                        {
+                            <div class="border rounded p-3 mb-3 bg-light">
+                                <h6>@(editingOffering == null ? "Add Offering" : "Edit Offering")</h6>
+                                <div class="row g-2">
+                                    <div class="col-12">
+                                        <label class="form-label">Supplier</label>
+                                        <select class="form-select" @bind="newOffering.SupplierId">
+                                            <option value="0">-- Select Supplier --</option>
+                                            @foreach (var supplier in suppliers)
+                                            {
+                                                <option value="@supplier.Id">@supplier.Name</option>
+                                            }
+                                        </select>
+                                    </div>
+                                    <div class="col-md-6">
+                                        <label class="form-label">Part Number</label>
+                                        <InputText class="form-control" @bind-Value="newOffering.PartNumber" />
+                                    </div>
+                                    <div class="col-md-6">
+                                        <label class="form-label">Price</label>
+                                        <InputNumber class="form-control" @bind-Value="newOffering.Price" placeholder="0.00" />
+                                    </div>
+                                    <div class="col-12">
+                                        <label class="form-label">Supplier Description</label>
+                                        <InputText class="form-control" @bind-Value="newOffering.SupplierDescription" />
+                                    </div>
+                                    <div class="col-12">
+                                        <label class="form-label">Notes</label>
+                                        <InputText class="form-control" @bind-Value="newOffering.Notes" />
+                                    </div>
+                                </div>
+                                @if (!string.IsNullOrEmpty(offeringErrorMessage))
+                                {
+                                    <div class="alert alert-danger mt-2 mb-0">@offeringErrorMessage</div>
+                                }
+                                <div class="mt-3 d-flex gap-2">
+                                    <button class="btn btn-primary btn-sm" @onclick="SaveOfferingAsync" disabled="@savingOffering">
+                                        @if (savingOffering)
+                                        {
+                                            <span class="spinner-border spinner-border-sm me-1"></span>
+                                        }
+                                        @(editingOffering == null ? "Add" : "Save")
+                                    </button>
+                                    <button class="btn btn-outline-secondary btn-sm" @onclick="CancelOfferingForm">Cancel</button>
+                                </div>
+                            </div>
+                        }
+
+                        @if (offerings.Count == 0)
+                        {
+                            <p class="text-muted">No supplier offerings configured yet.</p>
+                        }
+                        else
+                        {
+                            <table class="table table-sm">
+                                <thead>
+                                    <tr>
+                                        <th>Supplier</th>
+                                        <th>Part #</th>
+                                        <th>Price</th>
+                                        <th style="width: 100px;">Actions</th>
+                                    </tr>
+                                </thead>
+                                <tbody>
+                                    @foreach (var offering in offerings)
+                                    {
+                                        <tr>
+                                            <td>@offering.Supplier.Name</td>
+                                            <td>@(offering.PartNumber ?? "-")</td>
+                                            <td>@(offering.Price.HasValue ? offering.Price.Value.ToString("C") : "-")</td>
+                                            <td>
+                                                <button class="btn btn-sm btn-outline-primary" @onclick="() => EditOffering(offering)">Edit</button>
+                                                <button class="btn btn-sm btn-outline-danger" @onclick="() => ConfirmDeleteOffering(offering)">Delete</button>
+                                            </td>
+                                        </tr>
+                                    }
+                                </tbody>
+                            </table>
+                        }
+                    </div>
+                </div>
+            </div>
+        }
+    </div>
+}
+
+<ConfirmDialog @ref="deleteOfferingDialog"
+               Title="Delete Offering"
+               Message="@deleteOfferingMessage"
+               ConfirmText="Delete"
+               OnConfirm="DeleteOfferingConfirmed" />
+
+@code {
+    [Parameter]
+    public int? Id { get; set; }
+
+    private StockItem stockItem = new();
+    private List<Material> materials = new();
+    private List<Supplier> suppliers = new();
+    private List<SupplierOffering> offerings = new();
+    private bool loading = true;
+    private bool saving;
+    private bool savingOffering;
+    private string? errorMessage;
+    private string? offeringErrorMessage;
+
+    private bool showOfferingForm;
+    private SupplierOffering newOffering = new();
+    private SupplierOffering? editingOffering;
+
+    private ConfirmDialog deleteOfferingDialog = null!;
+    private SupplierOffering? offeringToDelete;
+    private string deleteOfferingMessage = "";
+
+    private bool IsNew => !Id.HasValue;
+
+    protected override async Task OnInitializedAsync()
+    {
+        materials = await MaterialService.GetAllAsync();
+        suppliers = await SupplierService.GetAllAsync();
+
+        if (Id.HasValue)
+        {
+            var existing = await StockItemService.GetByIdAsync(Id.Value);
+            if (existing == null)
+            {
+                Navigation.NavigateTo("stock");
+                return;
+            }
+            stockItem = existing;
+            offerings = existing.SupplierOfferings.Where(o => o.IsActive).ToList();
+        }
+        loading = false;
+    }
+
+    private async Task SaveStockItemAsync()
+    {
+        errorMessage = null;
+        saving = true;
+
+        try
+        {
+            if (stockItem.MaterialId == 0)
+            {
+                errorMessage = "Please select a material";
+                return;
+            }
+
+            if (stockItem.LengthInches <= 0)
+            {
+                errorMessage = "Length must be greater than zero";
+                return;
+            }
+
+            var exists = await StockItemService.ExistsAsync(
+                stockItem.MaterialId,
+                stockItem.LengthInches,
+                IsNew ? null : stockItem.Id);
+
+            if (exists)
+            {
+                errorMessage = "A stock item with this material and length already exists";
+                return;
+            }
+
+            if (IsNew)
+            {
+                var created = await StockItemService.CreateAsync(stockItem);
+                Navigation.NavigateTo($"stock/{created.Id}");
+            }
+            else
+            {
+                await StockItemService.UpdateAsync(stockItem);
+            }
+        }
+        finally
+        {
+            saving = false;
+        }
+    }
+
+    private void ShowAddOfferingForm()
+    {
+        editingOffering = null;
+        newOffering = new SupplierOffering { StockItemId = Id!.Value };
+        showOfferingForm = true;
+        offeringErrorMessage = null;
+    }
+
+    private void EditOffering(SupplierOffering offering)
+    {
+        editingOffering = offering;
+        newOffering = new SupplierOffering
+        {
+            Id = offering.Id,
+            StockItemId = offering.StockItemId,
+            SupplierId = offering.SupplierId,
+            PartNumber = offering.PartNumber,
+            SupplierDescription = offering.SupplierDescription,
+            Price = offering.Price,
+            Notes = offering.Notes
+        };
+        showOfferingForm = true;
+        offeringErrorMessage = null;
+    }
+
+    private void CancelOfferingForm()
+    {
+        showOfferingForm = false;
+        editingOffering = null;
+        offeringErrorMessage = null;
+    }
+
+    private async Task SaveOfferingAsync()
+    {
+        offeringErrorMessage = null;
+        savingOffering = true;
+
+        try
+        {
+            if (newOffering.SupplierId == 0)
+            {
+                offeringErrorMessage = "Please select a supplier";
+                return;
+            }
+
+            var exists = await SupplierService.OfferingExistsAsync(
+                newOffering.SupplierId,
+                newOffering.StockItemId,
+                editingOffering?.Id);
+
+            if (exists)
+            {
+                offeringErrorMessage = "This supplier already has an offering for this stock item";
+                return;
+            }
+
+            if (editingOffering == null)
+            {
+                await SupplierService.AddOfferingAsync(newOffering);
+            }
+            else
+            {
+                await SupplierService.UpdateOfferingAsync(newOffering);
+            }
+
+            // Refresh the stock item to get updated offerings
+            var updated = await StockItemService.GetByIdAsync(Id!.Value);
+            if (updated != null)
+            {
+                stockItem = updated;
+                offerings = updated.SupplierOfferings.Where(o => o.IsActive).ToList();
+            }
+            showOfferingForm = false;
+            editingOffering = null;
+        }
+        finally
+        {
+            savingOffering = false;
+        }
+    }
+
+    private void ConfirmDeleteOffering(SupplierOffering offering)
+    {
+        offeringToDelete = offering;
+        deleteOfferingMessage = $"Are you sure you want to delete the offering from {offering.Supplier.Name}?";
+        deleteOfferingDialog.Show();
+    }
+
+    private async Task DeleteOfferingConfirmed()
+    {
+        if (offeringToDelete != null)
+        {
+            await SupplierService.DeleteOfferingAsync(offeringToDelete.Id);
+
+            // Refresh the stock item to get updated offerings
+            var updated = await StockItemService.GetByIdAsync(Id!.Value);
+            if (updated != null)
+            {
+                stockItem = updated;
+                offerings = updated.SupplierOfferings.Where(o => o.IsActive).ToList();
+            }
+        }
+    }
+}

CutList.Web/Components/Pages/Stock/Index.razor

@@ -0,0 +1,85 @@
+@page "/stock"
+@inject StockItemService StockItemService
+@inject NavigationManager Navigation
+@using CutList.Core.Formatting
+
+<PageTitle>Stock Items</PageTitle>
+
+<div class="d-flex justify-content-between align-items-center mb-3">
+    <h1>Stock Items</h1>
+    <a href="stock/new" class="btn btn-primary">Add Stock Item</a>
+</div>
+
+@if (loading)
+{
+    <p><em>Loading...</em></p>
+}
+else if (stockItems.Count == 0)
+{
+    <div class="alert alert-info">
+        No stock items found. <a href="stock/new">Add your first stock item</a>.
+    </div>
+}
+else
+{
+    <table class="table table-striped table-hover">
+        <thead>
+            <tr>
+                <th>Material</th>
+                <th>Length</th>
+                <th>Name</th>
+                <th style="width: 120px;">Actions</th>
+            </tr>
+        </thead>
+        <tbody>
+            @foreach (var item in stockItems)
+            {
+                <tr>
+                    <td>@item.Material.DisplayName</td>
+                    <td>@ArchUnits.FormatFromInches((double)item.LengthInches)</td>
+                    <td>@(item.Name ?? "-")</td>
+                    <td>
+                        <a href="stock/@item.Id" class="btn btn-sm btn-outline-primary">Edit</a>
+                        <button class="btn btn-sm btn-outline-danger" @onclick="() => ConfirmDelete(item)">Delete</button>
+                    </td>
+                </tr>
+            }
+        </tbody>
+    </table>
+}
+
+<ConfirmDialog @ref="deleteDialog"
+               Title="Delete Stock Item"
+               Message="@deleteMessage"
+               ConfirmText="Delete"
+               OnConfirm="DeleteConfirmed" />
+
+@code {
+    private List<StockItem> stockItems = new();
+    private bool loading = true;
+    private ConfirmDialog deleteDialog = null!;
+    private StockItem? itemToDelete;
+    private string deleteMessage = "";
+
+    protected override async Task OnInitializedAsync()
+    {
+        stockItems = await StockItemService.GetAllAsync();
+        loading = false;
+    }
+
+    private void ConfirmDelete(StockItem item)
+    {
+        itemToDelete = item;
+        deleteMessage = $"Are you sure you want to delete \"{item.Material.DisplayName} - {ArchUnits.FormatFromInches((double)item.LengthInches)}\"?";
+        deleteDialog.Show();
+    }
+
+    private async Task DeleteConfirmed()
+    {
+        if (itemToDelete != null)
+        {
+            await StockItemService.DeleteAsync(itemToDelete.Id);
+            stockItems = await StockItemService.GetAllAsync();
+        }
+    }
+}

CutList.Web/Components/Pages/Suppliers/Edit.razor

@@ -1,9 +1,10 @@
 @page "/suppliers/new"
 @page "/suppliers/{Id:int}"
 @inject SupplierService SupplierService
-@inject MaterialService MaterialService
 @inject NavigationManager Navigation
+@inject CutList.Web.Data.ApplicationDbContext DbContext
 @using CutList.Core.Formatting
+@using Microsoft.EntityFrameworkCore
 
 <PageTitle>@(IsNew ? "Add Supplier" : "Edit Supplier")</PageTitle>
 
@@ -66,80 +67,84 @@ else
             <div class="col-lg-6">
                 <div class="card">
                     <div class="card-header d-flex justify-content-between align-items-center">
-                        <h5 class="mb-0">Stock Lengths</h5>
-                        <button class="btn btn-sm btn-primary" @onclick="ShowAddStockForm">Add Stock</button>
+                        <h5 class="mb-0">Supplier Offerings</h5>
+                        <button class="btn btn-sm btn-primary" @onclick="ShowAddOfferingForm">Add Offering</button>
                     </div>
                     <div class="card-body">
-                        @if (showStockForm)
+                        @if (showOfferingForm)
                         {
                             <div class="border rounded p-3 mb-3 bg-light">
-                                <h6>@(editingStock == null ? "Add Stock Length" : "Edit Stock Length")</h6>
+                                <h6>@(editingOffering == null ? "Add Offering" : "Edit Offering")</h6>
                                 <div class="row g-2">
-                                    <div class="col-md-6">
-                                        <label class="form-label">Material</label>
-                                        <select class="form-select" @bind="newStock.MaterialId">
-                                            <option value="0">-- Select Material --</option>
-                                            @foreach (var material in materials)
+                                    <div class="col-12">
+                                        <label class="form-label">Stock Item</label>
+                                        <select class="form-select" @bind="newOffering.StockItemId">
+                                            <option value="0">-- Select Stock Item --</option>
+                                            @foreach (var stockItem in stockItems)
                                             {
-                                                <option value="@material.Id">@material.DisplayName</option>
+                                                <option value="@stockItem.Id">@stockItem.Material.DisplayName - @ArchUnits.FormatFromInches((double)stockItem.LengthInches)</option>
                                             }
                                         </select>
                                     </div>
                                     <div class="col-md-6">
-                                        <label class="form-label">Length</label>
-                                        <LengthInput @bind-Value="newStock.LengthInches" />
+                                        <label class="form-label">Part Number</label>
+                                        <InputText class="form-control" @bind-Value="newOffering.PartNumber" />
                                     </div>
                                     <div class="col-md-6">
-                                        <label class="form-label">Price (optional)</label>
-                                        <InputNumber class="form-control" @bind-Value="newStock.Price" placeholder="0.00" />
+                                        <label class="form-label">Price</label>
+                                        <InputNumber class="form-control" @bind-Value="newOffering.Price" placeholder="0.00" />
                                     </div>
-                                    <div class="col-md-6">
+                                    <div class="col-12">
+                                        <label class="form-label">Supplier Description</label>
+                                        <InputText class="form-control" @bind-Value="newOffering.SupplierDescription" />
+                                    </div>
+                                    <div class="col-12">
                                         <label class="form-label">Notes</label>
-                                        <InputText class="form-control" @bind-Value="newStock.Notes" />
+                                        <InputText class="form-control" @bind-Value="newOffering.Notes" />
                                     </div>
                                 </div>
-                                @if (!string.IsNullOrEmpty(stockErrorMessage))
+                                @if (!string.IsNullOrEmpty(offeringErrorMessage))
                                 {
-                                    <div class="alert alert-danger mt-2 mb-0">@stockErrorMessage</div>
+                                    <div class="alert alert-danger mt-2 mb-0">@offeringErrorMessage</div>
                                 }
                                 <div class="mt-3 d-flex gap-2">
-                                    <button class="btn btn-primary btn-sm" @onclick="SaveStockAsync" disabled="@savingStock">
-                                        @if (savingStock)
+                                    <button class="btn btn-primary btn-sm" @onclick="SaveOfferingAsync" disabled="@savingOffering">
+                                        @if (savingOffering)
                                         {
                                             <span class="spinner-border spinner-border-sm me-1"></span>
                                         }
-                                        @(editingStock == null ? "Add" : "Save")
+                                        @(editingOffering == null ? "Add" : "Save")
                                     </button>
-                                    <button class="btn btn-outline-secondary btn-sm" @onclick="CancelStockForm">Cancel</button>
+                                    <button class="btn btn-outline-secondary btn-sm" @onclick="CancelOfferingForm">Cancel</button>
                                 </div>
                             </div>
                         }
 
-                        @if (stocks.Count == 0)
+                        @if (offerings.Count == 0)
                         {
-                            <p class="text-muted">No stock lengths configured yet.</p>
+                            <p class="text-muted">No offerings configured yet.</p>
                         }
                         else
                         {
                             <table class="table table-sm">
                                 <thead>
                                     <tr>
-                                        <th>Material</th>
-                                        <th>Length</th>
+                                        <th>Stock Item</th>
+                                        <th>Part #</th>
                                         <th>Price</th>
                                         <th style="width: 100px;">Actions</th>
                                     </tr>
                                 </thead>
                                 <tbody>
-                                    @foreach (var stock in stocks)
+                                    @foreach (var offering in offerings)
                                     {
                                         <tr>
-                                            <td>@stock.Material.DisplayName</td>
-                                            <td>@ArchUnits.FormatFromInches((double)stock.LengthInches)</td>
-                                            <td>@(stock.Price.HasValue ? stock.Price.Value.ToString("C") : "-")</td>
+                                            <td>@offering.StockItem.Material.DisplayName - @ArchUnits.FormatFromInches((double)offering.StockItem.LengthInches)</td>
+                                            <td>@(offering.PartNumber ?? "-")</td>
+                                            <td>@(offering.Price.HasValue ? offering.Price.Value.ToString("C") : "-")</td>
                                             <td>
-                                                <button class="btn btn-sm btn-outline-primary" @onclick="() => EditStock(stock)">Edit</button>
-                                                <button class="btn btn-sm btn-outline-danger" @onclick="() => ConfirmDeleteStock(stock)">Delete</button>
+                                                <button class="btn btn-sm btn-outline-primary" @onclick="() => EditOffering(offering)">Edit</button>
+                                                <button class="btn btn-sm btn-outline-danger" @onclick="() => ConfirmDeleteOffering(offering)">Delete</button>
                                             </td>
                                         </tr>
                                     }
@@ -153,38 +158,44 @@ else
     </div>
 }
 
-<ConfirmDialog @ref="deleteStockDialog"
-               Title="Delete Stock Length"
-               Message="@deleteStockMessage"
+<ConfirmDialog @ref="deleteOfferingDialog"
+               Title="Delete Offering"
+               Message="@deleteOfferingMessage"
                ConfirmText="Delete"
-               OnConfirm="DeleteStockConfirmed" />
+               OnConfirm="DeleteOfferingConfirmed" />
 
 @code {
     [Parameter]
     public int? Id { get; set; }
 
     private Supplier supplier = new();
-    private List<SupplierStock> stocks = new();
-    private List<Material> materials = new();
+    private List<SupplierOffering> offerings = new();
+    private List<StockItem> stockItems = new();
     private bool loading = true;
     private bool savingSupplier;
-    private bool savingStock;
+    private bool savingOffering;
     private string? supplierErrorMessage;
-    private string? stockErrorMessage;
+    private string? offeringErrorMessage;
 
-    private bool showStockForm;
-    private SupplierStock newStock = new();
-    private SupplierStock? editingStock;
+    private bool showOfferingForm;
+    private SupplierOffering newOffering = new();
+    private SupplierOffering? editingOffering;
 
-    private ConfirmDialog deleteStockDialog = null!;
-    private SupplierStock? stockToDelete;
-    private string deleteStockMessage = "";
+    private ConfirmDialog deleteOfferingDialog = null!;
+    private SupplierOffering? offeringToDelete;
+    private string deleteOfferingMessage = "";
 
     private bool IsNew => !Id.HasValue;
 
     protected override async Task OnInitializedAsync()
     {
-        materials = await MaterialService.GetAllAsync();
+        stockItems = await DbContext.StockItems
+            .Include(si => si.Material)
+            .Where(si => si.IsActive)
+            .OrderBy(si => si.Material.Shape)
+            .ThenBy(si => si.Material.Size)
+            .ThenBy(si => si.LengthInches)
+            .ToListAsync();
 
         if (Id.HasValue)
         {
@@ -195,7 +206,7 @@ else
                 return;
             }
             supplier = existing;
-            stocks = await SupplierService.GetStocksForSupplierAsync(Id.Value);
+            offerings = await SupplierService.GetOfferingsForSupplierAsync(Id.Value);
         }
         loading = false;
     }
@@ -229,100 +240,94 @@ else
         }
     }
 
-    private void ShowAddStockForm()
+    private void ShowAddOfferingForm()
     {
-        editingStock = null;
-        newStock = new SupplierStock { SupplierId = Id!.Value };
-        showStockForm = true;
-        stockErrorMessage = null;
+        editingOffering = null;
+        newOffering = new SupplierOffering { SupplierId = Id!.Value };
+        showOfferingForm = true;
+        offeringErrorMessage = null;
     }
 
-    private void EditStock(SupplierStock stock)
+    private void EditOffering(SupplierOffering offering)
     {
-        editingStock = stock;
-        newStock = new SupplierStock
+        editingOffering = offering;
+        newOffering = new SupplierOffering
         {
-            Id = stock.Id,
-            SupplierId = stock.SupplierId,
-            MaterialId = stock.MaterialId,
-            LengthInches = stock.LengthInches,
-            Price = stock.Price,
-            Notes = stock.Notes
+            Id = offering.Id,
+            SupplierId = offering.SupplierId,
+            StockItemId = offering.StockItemId,
+            PartNumber = offering.PartNumber,
+            SupplierDescription = offering.SupplierDescription,
+            Price = offering.Price,
+            Notes = offering.Notes
         };
-        showStockForm = true;
-        stockErrorMessage = null;
+        showOfferingForm = true;
+        offeringErrorMessage = null;
     }
 
-    private void CancelStockForm()
+    private void CancelOfferingForm()
     {
-        showStockForm = false;
-        editingStock = null;
-        stockErrorMessage = null;
+        showOfferingForm = false;
+        editingOffering = null;
+        offeringErrorMessage = null;
     }
 
-    private async Task SaveStockAsync()
+    private async Task SaveOfferingAsync()
     {
-        stockErrorMessage = null;
-        savingStock = true;
+        offeringErrorMessage = null;
+        savingOffering = true;
 
         try
         {
-            if (newStock.MaterialId == 0)
+            if (newOffering.StockItemId == 0)
             {
-                stockErrorMessage = "Please select a material";
+                offeringErrorMessage = "Please select a stock item";
                 return;
             }
 
-            if (newStock.LengthInches <= 0)
-            {
-                stockErrorMessage = "Length must be greater than zero";
-                return;
-            }
-
-            var exists = await SupplierService.StockExistsAsync(
-                newStock.SupplierId,
-                newStock.MaterialId,
-                newStock.LengthInches,
-                editingStock?.Id);
+            var exists = await SupplierService.OfferingExistsAsync(
+                newOffering.SupplierId,
+                newOffering.StockItemId,
+                editingOffering?.Id);
 
             if (exists)
             {
-                stockErrorMessage = "This stock length already exists for this material";
+                offeringErrorMessage = "This supplier already has an offering for this stock item";
                 return;
             }
 
-            if (editingStock == null)
+            if (editingOffering == null)
             {
-                await SupplierService.AddStockAsync(newStock);
+                await SupplierService.AddOfferingAsync(newOffering);
             }
             else
             {
-                await SupplierService.UpdateStockAsync(newStock);
+                await SupplierService.UpdateOfferingAsync(newOffering);
             }
 
-            stocks = await SupplierService.GetStocksForSupplierAsync(Id!.Value);
-            showStockForm = false;
-            editingStock = null;
+            offerings = await SupplierService.GetOfferingsForSupplierAsync(Id!.Value);
+            showOfferingForm = false;
+            editingOffering = null;
         }
         finally
         {
-            savingStock = false;
+            savingOffering = false;
         }
     }
 
-    private void ConfirmDeleteStock(SupplierStock stock)
+    private void ConfirmDeleteOffering(SupplierOffering offering)
     {
-        stockToDelete = stock;
-        deleteStockMessage = $"Are you sure you want to delete the {ArchUnits.FormatFromInches((double)stock.LengthInches)} stock length?";
-        deleteStockDialog.Show();
+        offeringToDelete = offering;
+        deleteOfferingMessage = $"Are you sure you want to delete the offering for {offering.StockItem.Material.DisplayName} - {ArchUnits.FormatFromInches((double)offering.StockItem.LengthInches)}?";
+        deleteOfferingDialog.Show();
     }
 
-    private async Task DeleteStockConfirmed()
+    private async Task DeleteOfferingConfirmed()
     {
-        if (stockToDelete != null)
+        if (offeringToDelete != null)
         {
-            await SupplierService.DeleteStockAsync(stockToDelete.Id);
-            stocks = await SupplierService.GetStocksForSupplierAsync(Id!.Value);
+            await SupplierService.DeleteOfferingAsync(offeringToDelete.Id);
+            offerings = await SupplierService.GetOfferingsForSupplierAsync(Id!.Value);
         }
     }
 }

CutList.Web/Data/ApplicationDbContext.cs

@@ -13,7 +13,8 @@ public class ApplicationDbContext : DbContext
     public DbSet<Material> Materials => Set<Material>();
     public DbSet<MaterialStockLength> MaterialStockLengths => Set<MaterialStockLength>();
     public DbSet<Supplier> Suppliers => Set<Supplier>();
-    public DbSet<SupplierStock> SupplierStocks => Set<SupplierStock>();
+    public DbSet<StockItem> StockItems => Set<StockItem>();
+    public DbSet<SupplierOffering> SupplierOfferings => Set<SupplierOffering>();
     public DbSet<CuttingTool> CuttingTools => Set<CuttingTool>();
     public DbSet<Project> Projects => Set<Project>();
     public DbSet<ProjectPart> ProjectParts => Set<ProjectPart>();
@@ -56,25 +57,42 @@ public class ApplicationDbContext : DbContext
             entity.Property(e => e.CreatedAt).HasDefaultValueSql("GETUTCDATE()");
         });
 
-        // SupplierStock
-        modelBuilder.Entity<SupplierStock>(entity =>
+        // StockItem
+        modelBuilder.Entity<StockItem>(entity =>
         {
             entity.HasKey(e => e.Id);
             entity.Property(e => e.LengthInches).HasPrecision(10, 4);
-            entity.Property(e => e.Price).HasPrecision(10, 2);
-            entity.Property(e => e.Notes).HasMaxLength(255);
-
-            entity.HasOne(e => e.Supplier)
-                .WithMany(s => s.Stocks)
-                .HasForeignKey(e => e.SupplierId)
-                .OnDelete(DeleteBehavior.Cascade);
+            entity.Property(e => e.Name).HasMaxLength(100);
+            entity.Property(e => e.CreatedAt).HasDefaultValueSql("GETUTCDATE()");
 
             entity.HasOne(e => e.Material)
-                .WithMany(m => m.SupplierStocks)
+                .WithMany(m => m.StockItems)
                 .HasForeignKey(e => e.MaterialId)
                 .OnDelete(DeleteBehavior.Cascade);
 
-            entity.HasIndex(e => new { e.SupplierId, e.MaterialId, e.LengthInches }).IsUnique();
+            entity.HasIndex(e => new { e.MaterialId, e.LengthInches }).IsUnique();
+        });
+
+        // SupplierOffering
+        modelBuilder.Entity<SupplierOffering>(entity =>
+        {
+            entity.HasKey(e => e.Id);
+            entity.Property(e => e.PartNumber).HasMaxLength(100);
+            entity.Property(e => e.SupplierDescription).HasMaxLength(255);
+            entity.Property(e => e.Price).HasPrecision(10, 2);
+            entity.Property(e => e.Notes).HasMaxLength(255);
+
+            entity.HasOne(e => e.StockItem)
+                .WithMany(s => s.SupplierOfferings)
+                .HasForeignKey(e => e.StockItemId)
+                .OnDelete(DeleteBehavior.Cascade);
+
+            entity.HasOne(e => e.Supplier)
+                .WithMany(s => s.Offerings)
+                .HasForeignKey(e => e.SupplierId)
+                .OnDelete(DeleteBehavior.Cascade);
+
+            entity.HasIndex(e => new { e.SupplierId, e.StockItemId }).IsUnique();
         });
 
         // CuttingTool

CutList.Web/Data/Entities/Material.cs

@@ -10,7 +10,7 @@ public class Material
     public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
     public DateTime? UpdatedAt { get; set; }
 
-    public ICollection<SupplierStock> SupplierStocks { get; set; } = new List<SupplierStock>();
+    public ICollection<StockItem> StockItems { get; set; } = new List<StockItem>();
     public ICollection<MaterialStockLength> StockLengths { get; set; } = new List<MaterialStockLength>();
     public ICollection<ProjectPart> ProjectParts { get; set; } = new List<ProjectPart>();
 

CutList.Web/Data/Entities/StockItem.cs

@@ -0,0 +1,15 @@
+namespace CutList.Web.Data.Entities;
+
+public class StockItem
+{
+    public int Id { get; set; }
+    public int MaterialId { get; set; }
+    public decimal LengthInches { get; set; }
+    public string? Name { get; set; }
+    public bool IsActive { get; set; } = true;
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime? UpdatedAt { get; set; }
+
+    public Material Material { get; set; } = null!;
+    public ICollection<SupplierOffering> SupplierOfferings { get; set; } = new List<SupplierOffering>();
+}

CutList.Web/Data/Entities/Supplier.cs

@@ -9,5 +9,5 @@ public class Supplier
     public bool IsActive { get; set; } = true;
     public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
 
-    public ICollection<SupplierStock> Stocks { get; set; } = new List<SupplierStock>();
+    public ICollection<SupplierOffering> Offerings { get; set; } = new List<SupplierOffering>();
 }

CutList.Web/Data/Entities/SupplierOffering.cs

@@ -1,15 +1,16 @@
 namespace CutList.Web.Data.Entities;
 
-public class SupplierStock
+public class SupplierOffering
 {
     public int Id { get; set; }
+    public int StockItemId { get; set; }
     public int SupplierId { get; set; }
-    public int MaterialId { get; set; }
-    public decimal LengthInches { get; set; }
+    public string? PartNumber { get; set; }
+    public string? SupplierDescription { get; set; }
     public decimal? Price { get; set; }
     public string? Notes { get; set; }
     public bool IsActive { get; set; } = true;
 
+    public StockItem StockItem { get; set; } = null!;
     public Supplier Supplier { get; set; } = null!;
-    public Material Material { get; set; } = null!;
 }

CutList.Web/Migrations/20260203032915_AddStockItemAndSupplierOffering.Designer.cs

@@ -0,0 +1,452 @@
+// <auto-generated />
+using System;
+using CutList.Web.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+#nullable disable
+
+namespace CutList.Web.Migrations
+{
+    [DbContext(typeof(ApplicationDbContext))]
+    [Migration("20260203032915_AddStockItemAndSupplierOffering")]
+    partial class AddStockItemAndSupplierOffering
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.11")
+                .HasAnnotation("Relational:MaxIdentifierLength", 128);
+
+            SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder);
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.CuttingTool", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<bool>("IsDefault")
+                        .HasColumnType("bit");
+
+                    b.Property<decimal>("KerfInches")
+                        .HasPrecision(6, 4)
+                        .HasColumnType("decimal(6,4)");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("CuttingTools");
+
+                    b.HasData(
+                        new
+                        {
+                            Id = 1,
+                            IsActive = true,
+                            IsDefault = true,
+                            KerfInches = 0.0625m,
+                            Name = "Bandsaw"
+                        },
+                        new
+                        {
+                            Id = 2,
+                            IsActive = true,
+                            IsDefault = false,
+                            KerfInches = 0.125m,
+                            Name = "Chop Saw"
+                        },
+                        new
+                        {
+                            Id = 3,
+                            IsActive = true,
+                            IsDefault = false,
+                            KerfInches = 0.0625m,
+                            Name = "Cold Cut Saw"
+                        },
+                        new
+                        {
+                            Id = 4,
+                            IsActive = true,
+                            IsDefault = false,
+                            KerfInches = 0.0625m,
+                            Name = "Hacksaw"
+                        });
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Material", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<string>("Description")
+                        .HasMaxLength(255)
+                        .HasColumnType("nvarchar(255)");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("Shape")
+                        .IsRequired()
+                        .HasMaxLength(50)
+                        .HasColumnType("nvarchar(50)");
+
+                    b.Property<string>("Size")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<DateTime?>("UpdatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Materials");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.MaterialStockLength", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<decimal>("LengthInches")
+                        .HasPrecision(10, 4)
+                        .HasColumnType("decimal(10,4)");
+
+                    b.Property<int>("MaterialId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Notes")
+                        .HasMaxLength(255)
+                        .HasColumnType("nvarchar(255)");
+
+                    b.Property<int>("Quantity")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MaterialId", "LengthInches")
+                        .IsUnique();
+
+                    b.ToTable("MaterialStockLengths");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Project", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<string>("Customer")
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<int?>("CuttingToolId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<string>("Notes")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<DateTime?>("UpdatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CuttingToolId");
+
+                    b.ToTable("Projects");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.ProjectPart", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<decimal>("LengthInches")
+                        .HasPrecision(10, 4)
+                        .HasColumnType("decimal(10,4)");
+
+                    b.Property<int>("MaterialId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<int>("ProjectId")
+                        .HasColumnType("int");
+
+                    b.Property<int>("Quantity")
+                        .HasColumnType("int");
+
+                    b.Property<int>("SortOrder")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MaterialId");
+
+                    b.HasIndex("ProjectId");
+
+                    b.ToTable("ProjectParts");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.StockItem", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<decimal>("LengthInches")
+                        .HasPrecision(10, 4)
+                        .HasColumnType("decimal(10,4)");
+
+                    b.Property<int>("MaterialId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Name")
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<DateTime?>("UpdatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MaterialId", "LengthInches")
+                        .IsUnique();
+
+                    b.ToTable("StockItems");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Supplier", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("ContactInfo")
+                        .HasMaxLength(500)
+                        .HasColumnType("nvarchar(500)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<string>("Notes")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Suppliers");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.SupplierOffering", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("Notes")
+                        .HasMaxLength(255)
+                        .HasColumnType("nvarchar(255)");
+
+                    b.Property<string>("PartNumber")
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<decimal?>("Price")
+                        .HasPrecision(10, 2)
+                        .HasColumnType("decimal(10,2)");
+
+                    b.Property<int>("StockItemId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("SupplierDescription")
+                        .HasMaxLength(255)
+                        .HasColumnType("nvarchar(255)");
+
+                    b.Property<int>("SupplierId")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("StockItemId");
+
+                    b.HasIndex("SupplierId", "StockItemId")
+                        .IsUnique();
+
+                    b.ToTable("SupplierOfferings");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.MaterialStockLength", b =>
+                {
+                    b.HasOne("CutList.Web.Data.Entities.Material", "Material")
+                        .WithMany("StockLengths")
+                        .HasForeignKey("MaterialId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Material");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Project", b =>
+                {
+                    b.HasOne("CutList.Web.Data.Entities.CuttingTool", "CuttingTool")
+                        .WithMany("Projects")
+                        .HasForeignKey("CuttingToolId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.Navigation("CuttingTool");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.ProjectPart", b =>
+                {
+                    b.HasOne("CutList.Web.Data.Entities.Material", "Material")
+                        .WithMany("ProjectParts")
+                        .HasForeignKey("MaterialId")
+                        .OnDelete(DeleteBehavior.Restrict)
+                        .IsRequired();
+
+                    b.HasOne("CutList.Web.Data.Entities.Project", "Project")
+                        .WithMany("Parts")
+                        .HasForeignKey("ProjectId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Material");
+
+                    b.Navigation("Project");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.StockItem", b =>
+                {
+                    b.HasOne("CutList.Web.Data.Entities.Material", "Material")
+                        .WithMany("StockItems")
+                        .HasForeignKey("MaterialId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Material");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.SupplierOffering", b =>
+                {
+                    b.HasOne("CutList.Web.Data.Entities.StockItem", "StockItem")
+                        .WithMany("SupplierOfferings")
+                        .HasForeignKey("StockItemId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("CutList.Web.Data.Entities.Supplier", "Supplier")
+                        .WithMany("Offerings")
+                        .HasForeignKey("SupplierId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("StockItem");
+
+                    b.Navigation("Supplier");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.CuttingTool", b =>
+                {
+                    b.Navigation("Projects");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Material", b =>
+                {
+                    b.Navigation("ProjectParts");
+
+                    b.Navigation("StockItems");
+
+                    b.Navigation("StockLengths");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Project", b =>
+                {
+                    b.Navigation("Parts");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.StockItem", b =>
+                {
+                    b.Navigation("SupplierOfferings");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.Supplier", b =>
+                {
+                    b.Navigation("Offerings");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

CutList.Web/Migrations/20260203032915_AddStockItemAndSupplierOffering.cs

@@ -0,0 +1,141 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace CutList.Web.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddStockItemAndSupplierOffering : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "SupplierStocks");
+
+            migrationBuilder.CreateTable(
+                name: "StockItems",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "int", nullable: false)
+                        .Annotation("SqlServer:Identity", "1, 1"),
+                    MaterialId = table.Column<int>(type: "int", nullable: false),
+                    LengthInches = table.Column<decimal>(type: "decimal(10,4)", precision: 10, scale: 4, nullable: false),
+                    Name = table.Column<string>(type: "nvarchar(100)", maxLength: 100, nullable: true),
+                    IsActive = table.Column<bool>(type: "bit", nullable: false),
+                    CreatedAt = table.Column<DateTime>(type: "datetime2", nullable: false, defaultValueSql: "GETUTCDATE()"),
+                    UpdatedAt = table.Column<DateTime>(type: "datetime2", nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_StockItems", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_StockItems_Materials_MaterialId",
+                        column: x => x.MaterialId,
+                        principalTable: "Materials",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "SupplierOfferings",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "int", nullable: false)
+                        .Annotation("SqlServer:Identity", "1, 1"),
+                    StockItemId = table.Column<int>(type: "int", nullable: false),
+                    SupplierId = table.Column<int>(type: "int", nullable: false),
+                    PartNumber = table.Column<string>(type: "nvarchar(100)", maxLength: 100, nullable: true),
+                    SupplierDescription = table.Column<string>(type: "nvarchar(255)", maxLength: 255, nullable: true),
+                    Price = table.Column<decimal>(type: "decimal(10,2)", precision: 10, scale: 2, nullable: true),
+                    Notes = table.Column<string>(type: "nvarchar(255)", maxLength: 255, nullable: true),
+                    IsActive = table.Column<bool>(type: "bit", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_SupplierOfferings", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_SupplierOfferings_StockItems_StockItemId",
+                        column: x => x.StockItemId,
+                        principalTable: "StockItems",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_SupplierOfferings_Suppliers_SupplierId",
+                        column: x => x.SupplierId,
+                        principalTable: "Suppliers",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_StockItems_MaterialId_LengthInches",
+                table: "StockItems",
+                columns: new[] { "MaterialId", "LengthInches" },
+                unique: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_SupplierOfferings_StockItemId",
+                table: "SupplierOfferings",
+                column: "StockItemId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_SupplierOfferings_SupplierId_StockItemId",
+                table: "SupplierOfferings",
+                columns: new[] { "SupplierId", "StockItemId" },
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "SupplierOfferings");
+
+            migrationBuilder.DropTable(
+                name: "StockItems");
+
+            migrationBuilder.CreateTable(
+                name: "SupplierStocks",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "int", nullable: false)
+                        .Annotation("SqlServer:Identity", "1, 1"),
+                    MaterialId = table.Column<int>(type: "int", nullable: false),
+                    SupplierId = table.Column<int>(type: "int", nullable: false),
+                    IsActive = table.Column<bool>(type: "bit", nullable: false),
+                    LengthInches = table.Column<decimal>(type: "decimal(10,4)", precision: 10, scale: 4, nullable: false),
+                    Notes = table.Column<string>(type: "nvarchar(255)", maxLength: 255, nullable: true),
+                    Price = table.Column<decimal>(type: "decimal(10,2)", precision: 10, scale: 2, nullable: true)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_SupplierStocks", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_SupplierStocks_Materials_MaterialId",
+                        column: x => x.MaterialId,
+                        principalTable: "Materials",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_SupplierStocks_Suppliers_SupplierId",
+                        column: x => x.SupplierId,
+                        principalTable: "Suppliers",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_SupplierStocks_MaterialId",
+                table: "SupplierStocks",
+                column: "MaterialId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_SupplierStocks_SupplierId_MaterialId_LengthInches",
+                table: "SupplierStocks",
+                columns: new[] { "SupplierId", "MaterialId", "LengthInches" },
+                unique: true);
+        }
+    }
+}

CutList.Web/Migrations/ApplicationDbContextModelSnapshot.cs

@@ -231,6 +231,44 @@ namespace CutList.Web.Migrations
                     b.ToTable("ProjectParts");
                 });
 
+            modelBuilder.Entity("CutList.Web.Data.Entities.StockItem", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<DateTime>("CreatedAt")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("datetime2")
+                        .HasDefaultValueSql("GETUTCDATE()");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("bit");
+
+                    b.Property<decimal>("LengthInches")
+                        .HasPrecision(10, 4)
+                        .HasColumnType("decimal(10,4)");
+
+                    b.Property<int>("MaterialId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Name")
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
+                    b.Property<DateTime?>("UpdatedAt")
+                        .HasColumnType("datetime2");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MaterialId", "LengthInches")
+                        .IsUnique();
+
+                    b.ToTable("StockItems");
+                });
+
             modelBuilder.Entity("CutList.Web.Data.Entities.Supplier", b =>
                 {
                     b.Property<int>("Id")
@@ -264,7 +302,7 @@ namespace CutList.Web.Migrations
                     b.ToTable("Suppliers");
                 });
 
-            modelBuilder.Entity("CutList.Web.Data.Entities.SupplierStock", b =>
+            modelBuilder.Entity("CutList.Web.Data.Entities.SupplierOffering", b =>
                 {
                     b.Property<int>("Id")
                         .ValueGeneratedOnAdd()
@@ -275,32 +313,36 @@ namespace CutList.Web.Migrations
                     b.Property<bool>("IsActive")
                         .HasColumnType("bit");
 
-                    b.Property<decimal>("LengthInches")
-                        .HasPrecision(10, 4)
-                        .HasColumnType("decimal(10,4)");
-
-                    b.Property<int>("MaterialId")
-                        .HasColumnType("int");
-
                     b.Property<string>("Notes")
                         .HasMaxLength(255)
                         .HasColumnType("nvarchar(255)");
 
+                    b.Property<string>("PartNumber")
+                        .HasMaxLength(100)
+                        .HasColumnType("nvarchar(100)");
+
                     b.Property<decimal?>("Price")
                         .HasPrecision(10, 2)
                         .HasColumnType("decimal(10,2)");
 
+                    b.Property<int>("StockItemId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("SupplierDescription")
+                        .HasMaxLength(255)
+                        .HasColumnType("nvarchar(255)");
+
                     b.Property<int>("SupplierId")
                         .HasColumnType("int");
 
                     b.HasKey("Id");
 
-                    b.HasIndex("MaterialId");
+                    b.HasIndex("StockItemId");
 
-                    b.HasIndex("SupplierId", "MaterialId", "LengthInches")
+                    b.HasIndex("SupplierId", "StockItemId")
                         .IsUnique();
 
-                    b.ToTable("SupplierStocks");
+                    b.ToTable("SupplierOfferings");
                 });
 
             modelBuilder.Entity("CutList.Web.Data.Entities.MaterialStockLength", b =>
@@ -343,21 +385,32 @@ namespace CutList.Web.Migrations
                     b.Navigation("Project");
                 });
 
-            modelBuilder.Entity("CutList.Web.Data.Entities.SupplierStock", b =>
+            modelBuilder.Entity("CutList.Web.Data.Entities.StockItem", b =>
                 {
                     b.HasOne("CutList.Web.Data.Entities.Material", "Material")
-                        .WithMany("SupplierStocks")
+                        .WithMany("StockItems")
                         .HasForeignKey("MaterialId")
                         .OnDelete(DeleteBehavior.Cascade)
                         .IsRequired();
 
+                    b.Navigation("Material");
+                });
+
+            modelBuilder.Entity("CutList.Web.Data.Entities.SupplierOffering", b =>
+                {
+                    b.HasOne("CutList.Web.Data.Entities.StockItem", "StockItem")
+                        .WithMany("SupplierOfferings")
+                        .HasForeignKey("StockItemId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
                     b.HasOne("CutList.Web.Data.Entities.Supplier", "Supplier")
-                        .WithMany("Stocks")
+                        .WithMany("Offerings")
                         .HasForeignKey("SupplierId")
                         .OnDelete(DeleteBehavior.Cascade)
                         .IsRequired();
 
-                    b.Navigation("Material");
+                    b.Navigation("StockItem");
 
                     b.Navigation("Supplier");
                 });
@@ -371,9 +424,9 @@ namespace CutList.Web.Migrations
                 {
                     b.Navigation("ProjectParts");
 
-                    b.Navigation("StockLengths");
+                    b.Navigation("StockItems");
 
-                    b.Navigation("SupplierStocks");
+                    b.Navigation("StockLengths");
                 });
 
             modelBuilder.Entity("CutList.Web.Data.Entities.Project", b =>
@@ -381,9 +434,14 @@ namespace CutList.Web.Migrations
                     b.Navigation("Parts");
                 });
 
+            modelBuilder.Entity("CutList.Web.Data.Entities.StockItem", b =>
+                {
+                    b.Navigation("SupplierOfferings");
+                });
+
             modelBuilder.Entity("CutList.Web.Data.Entities.Supplier", b =>
                 {
-                    b.Navigation("Stocks");
+                    b.Navigation("Offerings");
                 });
 #pragma warning restore 612, 618
         }

CutList.Web/Program.cs

@@ -17,6 +17,7 @@ builder.Services.AddDbContext<ApplicationDbContext>(options =>
 // Add application services
 builder.Services.AddScoped<MaterialService>();
 builder.Services.AddScoped<SupplierService>();
+builder.Services.AddScoped<StockItemService>();
 builder.Services.AddScoped<ProjectService>();
 builder.Services.AddScoped<CutListPackingService>();
 builder.Services.AddScoped<ReportService>();

CutList.Web/Services/CutListPackingService.cs

@@ -38,8 +38,8 @@ public class CutListPackingService
                 .Where(s => s.MaterialId == materialId && s.IsActive && s.Quantity > 0)
                 .ToListAsync();
 
-            // Get supplier stock lengths for this material (for purchase)
-            var supplierLengths = await _context.SupplierStocks
+            // Get stock item lengths for this material (for purchase)
+            var stockItemLengths = await _context.StockItems
                 .Where(s => s.MaterialId == materialId && s.IsActive)
                 .Select(s => s.LengthInches)
                 .Distinct()
@@ -60,8 +60,8 @@ public class CutListPackingService
                 });
             }
 
-            // Supplier stock bins with unlimited quantity
-            foreach (var length in supplierLengths)
+            // Stock item bins with unlimited quantity
+            foreach (var length in stockItemLengths)
             {
                 // Only add if not already covered by in-stock
                 if (!stockBins.Any(b => b.LengthInches == length && b.IsInStock))

CutList.Web/Services/StockItemService.cs

@@ -0,0 +1,99 @@
+using CutList.Web.Data;
+using CutList.Web.Data.Entities;
+using Microsoft.EntityFrameworkCore;
+
+namespace CutList.Web.Services;
+
+public class StockItemService
+{
+    private readonly ApplicationDbContext _context;
+
+    public StockItemService(ApplicationDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<List<StockItem>> GetAllAsync(bool includeInactive = false)
+    {
+        var query = _context.StockItems
+            .Include(s => s.Material)
+            .AsQueryable();
+
+        if (!includeInactive)
+        {
+            query = query.Where(s => s.IsActive);
+        }
+
+        return await query
+            .OrderBy(s => s.Material.Shape)
+            .ThenBy(s => s.Material.Size)
+            .ThenBy(s => s.LengthInches)
+            .ToListAsync();
+    }
+
+    public async Task<List<StockItem>> GetByMaterialAsync(int materialId, bool includeInactive = false)
+    {
+        var query = _context.StockItems
+            .Include(s => s.Material)
+            .Where(s => s.MaterialId == materialId);
+
+        if (!includeInactive)
+        {
+            query = query.Where(s => s.IsActive);
+        }
+
+        return await query
+            .OrderBy(s => s.LengthInches)
+            .ToListAsync();
+    }
+
+    public async Task<StockItem?> GetByIdAsync(int id)
+    {
+        return await _context.StockItems
+            .Include(s => s.Material)
+            .Include(s => s.SupplierOfferings)
+            .ThenInclude(o => o.Supplier)
+            .FirstOrDefaultAsync(s => s.Id == id);
+    }
+
+    public async Task<StockItem> CreateAsync(StockItem stockItem)
+    {
+        stockItem.CreatedAt = DateTime.UtcNow;
+        _context.StockItems.Add(stockItem);
+        await _context.SaveChangesAsync();
+        return stockItem;
+    }
+
+    public async Task UpdateAsync(StockItem stockItem)
+    {
+        stockItem.UpdatedAt = DateTime.UtcNow;
+        _context.StockItems.Update(stockItem);
+        await _context.SaveChangesAsync();
+    }
+
+    public async Task DeleteAsync(int id)
+    {
+        var stockItem = await _context.StockItems.FindAsync(id);
+        if (stockItem != null)
+        {
+            stockItem.IsActive = false;
+            stockItem.UpdatedAt = DateTime.UtcNow;
+            await _context.SaveChangesAsync();
+        }
+    }
+
+    public async Task<bool> ExistsAsync(int materialId, decimal lengthInches, int? excludeId = null)
+    {
+        var query = _context.StockItems.Where(s =>
+            s.MaterialId == materialId &&
+            s.LengthInches == lengthInches &&
+            s.IsActive);
+
+        if (excludeId.HasValue)
+        {
+            query = query.Where(s => s.Id != excludeId.Value);
+        }
+
+        return await query.AnyAsync();
+    }
+}

CutList.Web/Services/SupplierService.cs

@@ -26,8 +26,9 @@ public class SupplierService
     public async Task<Supplier?> GetByIdAsync(int id)
     {
         return await _context.Suppliers
-            .Include(s => s.Stocks)
-            .ThenInclude(st => st.Material)
+            .Include(s => s.Offerings)
+            .ThenInclude(o => o.StockItem)
+            .ThenInclude(si => si.Material)
             .FirstOrDefaultAsync(s => s.Id == id);
     }
 
@@ -55,70 +56,70 @@ public class SupplierService
         }
     }
 
-    // Stock management
-    public async Task<List<SupplierStock>> GetStocksForSupplierAsync(int supplierId)
+    // Offering management
+    public async Task<List<SupplierOffering>> GetOfferingsForSupplierAsync(int supplierId)
     {
-        return await _context.SupplierStocks
-            .Include(s => s.Material)
-            .Where(s => s.SupplierId == supplierId && s.IsActive)
-            .OrderBy(s => s.Material.Shape)
-            .ThenBy(s => s.Material.Size)
-            .ThenBy(s => s.LengthInches)
+        return await _context.SupplierOfferings
+            .Include(o => o.StockItem)
+            .ThenInclude(si => si.Material)
+            .Where(o => o.SupplierId == supplierId && o.IsActive)
+            .OrderBy(o => o.StockItem.Material.Shape)
+            .ThenBy(o => o.StockItem.Material.Size)
+            .ThenBy(o => o.StockItem.LengthInches)
             .ToListAsync();
     }
 
-    public async Task<List<SupplierStock>> GetStocksForMaterialAsync(int materialId)
+    public async Task<List<SupplierOffering>> GetOfferingsForStockItemAsync(int stockItemId)
     {
-        return await _context.SupplierStocks
-            .Include(s => s.Supplier)
-            .Where(s => s.MaterialId == materialId && s.IsActive && s.Supplier.IsActive)
-            .OrderBy(s => s.Supplier.Name)
-            .ThenBy(s => s.LengthInches)
+        return await _context.SupplierOfferings
+            .Include(o => o.Supplier)
+            .Where(o => o.StockItemId == stockItemId && o.IsActive && o.Supplier.IsActive)
+            .OrderBy(o => o.Supplier.Name)
             .ToListAsync();
     }
 
-    public async Task<SupplierStock?> GetStockByIdAsync(int id)
+    public async Task<SupplierOffering?> GetOfferingByIdAsync(int id)
     {
-        return await _context.SupplierStocks
-            .Include(s => s.Material)
-            .Include(s => s.Supplier)
-            .FirstOrDefaultAsync(s => s.Id == id);
+        return await _context.SupplierOfferings
+            .Include(o => o.StockItem)
+            .ThenInclude(si => si.Material)
+            .Include(o => o.Supplier)
+            .FirstOrDefaultAsync(o => o.Id == id);
     }
 
-    public async Task<SupplierStock> AddStockAsync(SupplierStock stock)
+    public async Task<SupplierOffering> AddOfferingAsync(SupplierOffering offering)
     {
-        _context.SupplierStocks.Add(stock);
+        _context.SupplierOfferings.Add(offering);
         await _context.SaveChangesAsync();
-        return stock;
+        return offering;
     }
 
-    public async Task UpdateStockAsync(SupplierStock stock)
+    public async Task UpdateOfferingAsync(SupplierOffering offering)
     {
-        _context.SupplierStocks.Update(stock);
+        _context.SupplierOfferings.Update(offering);
         await _context.SaveChangesAsync();
     }
 
-    public async Task DeleteStockAsync(int id)
+    public async Task DeleteOfferingAsync(int id)
     {
-        var stock = await _context.SupplierStocks.FindAsync(id);
-        if (stock != null)
+        var offering = await _context.SupplierOfferings.FindAsync(id);
+        if (offering != null)
         {
-            stock.IsActive = false;
+            offering.IsActive = false;
             await _context.SaveChangesAsync();
         }
     }
 
-    public async Task<bool> StockExistsAsync(int supplierId, int materialId, decimal lengthInches, int? excludeId = null)
+    public async Task<bool> OfferingExistsAsync(int supplierId, int stockItemId, int? excludeId = null)
     {
-        var query = _context.SupplierStocks.Where(s =>
-            s.SupplierId == supplierId &&
-            s.MaterialId == materialId &&
-            s.LengthInches == lengthInches &&
-            s.IsActive);
+        var query = _context.SupplierOfferings.Where(o =>
+            o.SupplierId == supplierId &&
+            o.StockItemId == stockItemId &&
+            o.IsActive);
 
         if (excludeId.HasValue)
         {
-            query = query.Where(s => s.Id != excludeId.Value);
+            query = query.Where(o => o.Id != excludeId.Value);
         }
 
         return await query.AnyAsync();