This should be easy and not questioned here, but... How in IV(11) simple (extruded) cut can be done so, that both sides are keeped? Or you can't do this?
First I would use this possibility to create multibodys - like I did with SolidWorks . Another reason to use it is, for example, instead of using corner rip. (When I suddenly need a flat pattern from sheet metal box with closed corners...)