thx buddy, I will check that tonight when home. the tutorial doesn't say something about saving selections. also the maya docs don't mention something about selecting same faces for transfering (transfering extracted geometry isn't even covered in the docs). theory I thought is -> select obj1, shift select obj2 and choose Transfer to move the UVset from obj1 to obj2.

but what you said sounds pretty logical to me! I try that on a simple object.