Split the select notching or piercing punch into multiple pierces.
Piercing and notching holes need to be pierced in several steps due to geometry complexity.

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Split edges list out all the profiles split the punch Edge Extension set the undercut amount and direction Corner Feature 1 & 2 have options to select the corner type and the amount of undercut
Rectangular corner
Circular corner |
To produce split punch:

Normal notching punch only has cutting effect on the stock. Internal notching punch has cutting effect on the internal hole of the part.

To create Internal notching punch: