help creation punzone from particular catia v5

[rodendor]

Good morning to all,
Could someone help me create the punch from the inside of the particular attachment?
to build the matrix, I used Boolean operations, but for the punch I am having trouble.
Thank you in advance.

 

[gianni55]

extract the interior surfaces to the bottom floor
extract the inner edge of the surface (extracted)
create a flat surface as wide as the mold
Relic the flat surface with the extract
create the solid extruded mold up to the relimited surface

or attach the file instead of the image