diff --git a/PepApi.Core/PepHelper.cs b/PepApi.Core/PepHelper.cs
index ae9a2ad..5e54603 100644
--- a/PepApi.Core/PepHelper.cs
+++ b/PepApi.Core/PepHelper.cs
@@ -117,14 +117,30 @@ namespace PepApi.Core
             part.QtyNested = 0;
 
             var nestedOn = new List<int>();
-            var partName = part.Name.ToUpper();
+            // Normalize drawing names by stripping directories and extensions
+            // to make matching resilient to format differences between sources.
+            string Normalize(string? name)
+            {
+                if (string.IsNullOrWhiteSpace(name)) return string.Empty;
+                try
+                {
+                    var fileOnly = System.IO.Path.GetFileNameWithoutExtension(name);
+                    return fileOnly.ToUpperInvariant();
+                }
+                catch
+                {
+                    return name.Trim().ToUpperInvariant();
+                }
+            }
+
+            var partName = Normalize(part.Name);
 
             for (int i = 0; i < nest.Plates.Count; i++)
             {
                 var plate = nest.Plates[i];
                 var qtyNested = 0;
 
-                qtyNested = plate.Parts.Count(p => p.DrawingName?.ToUpper() == partName);
+                qtyNested = plate.Parts.Count(p => Normalize(p.DrawingName) == partName);
 
                 // plate.Duplicates is actually the quantity, so 1 Duplicate = 1 plate
                 qtyNested *= plate.Duplicates;