You can do a few different things. Traveller has a tutorial at Morph World that apparently explains how to make a separate figure that only has certain body parts (just the arms, for example). This can be parented to the original figure, creating interesting effects. You can create a new .obj for a new figure, and either hack the .cr2, or create a new .cr2 using the PHI method outlined in the P4 manual, or using the Hierarchy Editor in P4. If the final form of the new figure will closely mimic the layout of the original, you can make extensive use of the "replace body part with prop" feature to create a new figure. There should be bunches of tutorials for these procedures. Check the Tutorials section here at Renderosity.

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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.