Rotating a group of vertexes according to another vertex

Hi.

Selecting a group of vertices in a layer and using rotate tool won’t make the rotation based on a specific point and I need to replace it back, which gets hard with lots of vertices. Basically, I want to simulate the movement of a joint.

I thought rotate layer would work, but it also modifies underlying layers’ center points and naturally, rotates whole of the layer.

Is there a way to either do that kind of rotation or cut some vertices and paste them as a new layer so I can rotate them separately ? ?
Thanks.

What you’re asking is exactly what bones do. It is not implemented. You only have the alternative of the rotate layer and the encapsulation of the affected layers to stop the rotate layer work.
-G