You can do the grouping in UVMapper but it is easier to get the Auto Group Editor here at the MP :o) - at least I think so,as you can see the base model's groups with that, so you know where to "cut" :o) PWizard is great for making the cclothes conform after you've grouped it :o)

FREEBIES! | My Gallery | My Store | My FB | Tumblr |
You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.