When you add something like a prop, there is a button called "select Subset" Be sure to check all the parts you want to save (and be sure NOT to select Universe) and you will have your whole prop saved as one :o)

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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.