Back in the Poser 3 days, CR2Edit in its early versions would do it. It could not handle Poser 4 pz3. I know of no utility that can. Geep's method is best if you are willing to accept someone else's stage setup, and the easiest way at any rate. If, like me, you hate even seeing the setup, you remove all the crap between actors and the second geometry call, just before Channels and also the documents stuff after Materials, then put it in a Library with the correct extension.