Bones (and IKs) in 4.3

Godot Version

4.3

Question

I’m trying to figure out use skeletons, especially how to do IKs. There is the SkeletonIK3D node, but that’s deprecated. Tutorials that I’ve seen mention a modification stack that you can use to add IKs, but I can’t find that either, it might have been for an earlier version.

What is the correct way to set up IK chains in the current version of Godot?

Also, as far as skeletons go, is there any way to add or remove bones from a skeleton, or can they only be imported from an external file? I know that you can edit the location of bones in an existing skeleton.

Thanks