well, the individual hair groups become separate props. Nothing you can do about that ;). What ya can do is smart prop the parts to the skull cap (making the cap invisible so ya don't see it) and save the skullcap to the library with all the hair bits smart propped to it.

Just making groups on the skullcap won't create new props unless you "spawn" a prop, but the hair room automatically spawns a prop for every hair that you create there.

Laurie