Different ways to group entities

Hello all,

I am kind of new to AutoCAD development. I am writing functions that
place multiple entities at a time.

I would like these entities to be grouped. So that the end user can move
copy, etc and not have problems selecting these multiple entities.

From what I know about AutoCAD, I only have two choices: blocks or
groups. This alone is not bad, but it seems as though I will have to
create a unique name each time the user uses one of my functions. A user
may end up with hundreads of groups with unusual names. It just seems
like I will end up with a sloppy mess of names. Can I somehow group
things that are orphaned "no names", just "groups"?

Or is there a customary way of doing this that I am not aware of?

Jean-Paul