partstudio

Hi, Is there a way to import step files of assemblies and having a seperate part studio for each part in the assembly (preferably recognising instances of the same part) So NOT having all the parts in 1 part studio. Seems logical, but I can't find a way to do so. 

I have a prototype 3D shape made from cardboard and tape that I'd like to model for 3D printing. It looks like this (minus the flaps): At first I decided it would be best to start with a side profile and extrude. But it seems problematic with all the angles it has in 3D: So I tried lofting. It wouldn't allow me to create a…