Working with CAD family parts in SW 2024 and 3Dexperience.

When using the macro below, in SolidWorks parts, it's saying "property added" but it's not.

What do I need to change when I want to add a property to the active configuration/physical product only?

Dim swApp As Object Dim Part As ModelDoc2 Dim mExt As ModelDocExtension Dim propMgr As CustomPropertyManager Sub main() Set swApp = Application.SldWorks