I have done a rough head swap on a model. Tilting the head side to side makes my neck kind of protrude from my body and clip into the body and necklace. The problem is that that the bottom half of the neck is animated or weighted or whatever, and I'd rather it not be, I'd rather it just stay stationary.
In short, the thing I want is for the top half of the neck to stay animated and the bottom half to be still. Any help on how to do that? I have no idea how to make vertex groups or weight paint, etc.