a bodygroup changer question

This model has many bodygroups, but I can only change four skin, What reason ?

http://filesmelt.com/dl/russian3.jpg

You need the bodygroup changer Stool:
http://www.garrysmod.org/downloads/?a=view&id=84666

thanks,but I am using bodygroup changer to change, but I can only change four skin(Red circle at the screenshot)

You need to select a subgroup from the menu, e.g. Bodygroup 1, Subgroup 1