I am trying to create a partial cloth out of the GIRL catusuit. For example, instead using the transparancy, I want to cut away just the pants portion of the catsuit. I think I can create a dynamic prop using the grouping tool, but would this a right way to do it?

I did this by creating new groups for the pants portion of the catsuit, exported it, and imported it back again. However, when I run cloth simulation, the groups starts to tear apart from one another. I would really appreciate if someone can help me on this. Thanks