its related with use of punch in designing the sheet metal part.
Well its not that difficult in Pro E 5. I will show how to make a simple punch in sheet metal.
Answered with a tutorial: https://grabcad.com/tutorials/how-to-make-the-die-and-punch-in-sheetmetal
In solidworks is very easy - there exist a command forming tools for making a punch and die can maked from forming tool - it depens of sheetmetal material properties.