Create PPS character with legs, body and head

I would like to know where I can find a tutorial on how to make a Character that contains legs, body and head, all separated. Surely there must be but I wonder if I’m really looking for the correct term.

How can I make a script to manipulate the head, body and legs of a unique way to form a character?

Thank you for your attention and patience

Use a full body 3d character… and go and look into FinalIK ( buyable package ) or you can attempt to program your own IK(Inverse Kinematics) in.