As I said there are ways... However Ive yet to find a way other then by hand that will do it good enough where it wont mess with the animation process. Blender has a decimation moddifier as im sure other modeling packages do as well.

The main problem with it is that it just decimates the entire mesh and doesnt take in to concideration areas that are needed for animation such as knees elbows ect... Which most of the time really effects the way the animations look.

Your best bet would be either A. Find a different model import into poser rig and animate it or B. Remove the unnesscary polys by hand

http://www.freewebs.com/otama_syndicate/index.htm - Each master to his own technique.

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