With hair, most hair is either a smart prop, which should load parented, and in more or less the right place on the head of the currently selected figure. Or confoming figure hair, in which case it should be conformed to the character (Figure > Conform To, then select the character from the list). With items such as weapons, books, umbrellas, these should usually be parented to the appropriate hand of the character. As to grouping a number of props or figures together, the most flexible way is probably to parent the items to my 'MinFig' available in the Free Stuff. This not only allows you to scale, rotate, and translate, all items parented to it, but you can also save the whole group (props , figures, cameras, lights) by resaving MinFig to a pallet. Locking MinFig will also lock any props, lights, or cameras parented to it (but not figures). Hiding MinFig will hide any props parented to it. For just translating, rotating, and scalig a group, you can parent the items to a Poser SQUARE prop then hide the SQUARE.