Okay, so I started over and decided to group the pants before I took them into the Setup Room. But the set up room says I missed a few polygons. The screen shot shows several of the ones I missed. These  happen to belong to the left thigh, but they're listed as being a prop called Capris SETUP.

I tried adding them via the set up room, but they don't seem to take. So how can I get them to join their respective groupings?