Poser doesnt have a per-poly weighting scheme that is a newer way of doing bones. Poser 5 has the same bone system of poser 3 and 4. What I dont understand is the grouping part, in other programs you add some bones to an object and you can move the parts about, they don`t split apart however you place them, but in poser you make groups and if they are wrong some way the body parts split apart.