Hello,
I have to paint a military plane with high detailed elements (text, screws...) To do this I have devided my model in 20 pieces. Each piece has its own uvw (2048x2048px). Then in the paintroom I import the first piece, paint it and export it back to 3ds max. There is all well, the piece and the right texture. Then I imported it back to 3dc and add the second peace. The first piece is with the correct texture and on the second piece I can paint the texture on.
Now it were a very good feature when I can switch between several pieces and paint on its own uvw. And when I export the whole scene that there are all pieces in an own file with its own texture-file.