Creo Progressive Die Extension (PDX) Reference Guide > Using PDX > Strips > Stamp Reference Parts > Tip: Manually Changing Stamp Geometry
  
Tip: Manually Changing Stamp Geometry
Because stamp geometry is stored in the stamp reference part, these parts are frequently adjusted manually, for instance, when adding rounds or chamfers. When working with stamp reference parts, keep the following tips in mind:
The size of a non-sketched stamp reference part is driven by the dimensions of the first protrusion feature. Do not delete this feature.
Use a proxy stamp reference part if you need to manually reference article geometry. A proxy part prevents problems if the stamp reference part is moved.