Grouping items to make a single item is fine but when you want groups as separate objects, a pain in dee butt.
Once you group numerous items and then later want to edit them you have to ungroup them. Unfortunately when you select the ungroup tool EVERYTHING gets ungrouped and now you have a zillion items to select to edit. Why aren't separate groupings remembered like in just about ever other 3D program. Editing this way is awfully inefficient. You should be able to make one set of objects a group, then another set of items a group. Group those two items. Then those should be two item groups (combined into one). Later when you select this combined group and ungroup it. It should be two different group items NOT a bunch of different separate objects!