... actually this works if you want to create a sub-group that includes all entities of the parent group, but not if you want to create a sub-group that includes only SOME of the entities of the parent group. For instance, I start with a box, and I create one group for all walls, another for all roofs, and another for the floors.
I guess I could create multiple sub-groups using your method, and then erase everything that I don't want out of each group. Aarg! This is much more calculation intensive that I want!
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Karen