Well I'm no poser expert for sure but.... First, when you exported was it broken in to several parts? If so, once you get it in poser you can use the grouping tool to spawn prop. This should break it up for you. If the obj was welded before theres no way to break it up in poser. But even if it is a solid piece you should be able to do some movement with magnets, on a simple model like a star. Hope this helps

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"The true sign of intelligence is not knowledge but imagination".

Albert Einstein