Hanz' idea is great and will work. Another way is to export all of it as an obj, then reimport that obj. The parts have then been kidan glued together. You can save the complete thing to your props palette but that is optional. Hanz' version will give you a model where you can still remove parts of it (for camera placements or the like) Whereas my version will be one coherent thing :o) Your choice :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.