I don't have the beta and was able to test both combining figures and reducing polygons. Both worked for me. However, do be careful if you delete polygons, you can mess up your UV maps with it. Here is my test result. I combined figures and let it automatically delete the unseen polygons. It didn't do a good job with picking what to delete. There are spots in the eyebrows, back of the neck, and sole of the boots that are exposed but gone. And a good portion of the torso is still there. You can see the uv maps

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

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I use Poser 13 and win 10