Basic question: How to create bump to sheet metal in Keycreator?

Case is simple but this is too basics and no google can help, no manual, no tutorials. So I try ask here.

If make any sheetmetal product need sometimes "bump". Eg. I make simple metal box, eg. 500x500 mm and 10 mm, 1.5 mm sheet metal. Install it to wall, but sometimes need put backside of it little space.

In sheetmetal tool machine is any tool make "bump". It is as nipple... or, "homemade bump": Support sheet metal to any table. Make eg. 20 mm hole to table. Use any punch tool and hammer, and hit. Voilá, backside of sheet metal is bump.

Or, now I try make this bump: I take 0.5 mm rubber sheet. I take any hard material. I make 20 mm hole to this hard material. Then I take 5 mm balloon and press it to rubber, press until 2 mm deep. What happened? I see bump backside and it is rule, not random.

Any idea how to make this type "bump" in Keycreator?