How to move nodes individually in a 3D model

Hello!

Is there a way to modify (move and scale) only nodes individually in a 3D model?
In the example attached, I have the seymour.dae model from the jit.gl.model help patcher... I want to modify (move and scale) only one arm or one leg individually, for example.
Is there a way to modify each element of a 3D model that contains multiple nodes? (For example, modify only the head, or the hand, or the left arm... etc).
I hope I am being clear.
Thaaaanks and cheers!