Index: src/Plugins/Wti/Wti.Calculation/Wti.Calculation.csproj
===================================================================
diff -u -r3912a159ea7726b8b92966345440c2fff2b297e0 -r9f140a1d7ebc5dfaabd213c626b596ad55f66e56
--- src/Plugins/Wti/Wti.Calculation/Wti.Calculation.csproj	(.../Wti.Calculation.csproj)	(revision 3912a159ea7726b8b92966345440c2fff2b297e0)
+++ src/Plugins/Wti/Wti.Calculation/Wti.Calculation.csproj	(.../Wti.Calculation.csproj)	(revision 9f140a1d7ebc5dfaabd213c626b596ad55f66e56)
@@ -73,9 +73,11 @@
     <Reference Include="System.Core" />
   </ItemGroup>
   <ItemGroup>
-    <Compile Include="PipingCalculation.cs" />
-    <Compile Include="PipingCalculationInput.cs" />
-    <Compile Include="PipingCalculationResult.cs" />
+    <Compile Include="Piping\PipingCalculation.cs" />
+    <Compile Include="Piping\PipingCalculationInput.cs" />
+    <Compile Include="Piping\PipingCalculationResult.cs" />
+    <Compile Include="Piping\PipingProfileCreator.cs" />
+    <Compile Include="Piping\PipingSurfaceLineCreator.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Service Include="{94E38DFF-614B-4cbd-B67C-F211BB35CE8B}" />
   </ItemGroup>