State the problem, not your solution, ice boy. Engineers will give bad answeers because your question is misleading. Here is the problem. He has a mesh where all parts are needed for a simulation, but some parts are undesirable for rendering. How do you perform the simulation and then make part of it invisible. That is the problem. Now constraints on the solution. Transparency on the undesired polygons is a non starter. One, it is slow to render. Two, there are various buggy versions of Poser that will not let light through the transparency with the same results as would be if the polygons were invisible or simply did not exist. So, now offer solutions. It was brought up that moving the undesired polygons to a new group or actor or whatever would permit retention of the dynamics as well as setting visible to off on these polygons. He wants to know how to do that. Is that possible. I do not know.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)