Well, PoserFile Editor by D3D can do a lot of what you want, with one click. It has a Repair category that is GREAT for cleaning up groups. 

If I understand your question right, this may be what you need :) Plus it's a nice tool for a lot of other things as well :)

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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.