To remove an element, simply select it and press Delete. Deleting an element also removes all bones that are part of its local weights group. For example, if you delete any bone in a limb, this also deletes all the bones in the limb, the IK target, and any extra bones that have been added to the rig, regardless of whether they have ben relinked to other parts of the hierarchy.
To delete an entire CATRig, do one of the following:
To remove a digit (such as a finger):