I put together an "Old B.O.B.", from the Black Hole, using the primitives in Poser, and tried to use the Hierarchy Editor to create a figure that way, but Poser eliminated some of the parts when it converted the figure. I thought it might have something to do with P4 imposing the standard joint rotations. Right now the figure remains a set of parented objects in PZ3 form. How to fix?

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.