You can subdivide bones, to get two or more bones where there was just one bone. The tool will subdivide all selected bones, preserving the existing relationships: the bones created from a subdivision always form a connected chain of bones.
To create an arbitrary number of bones from each selected bone in the Subdivide Multi Adjust Last Operation panel.
- Number of Cuts
Specifies the number of cuts. As in mesh editing, if you set n cuts, you will get n + 1 bones for each selected bone.