How do you control multiple transforms?

Where can I find an absolute key that registers all the transform animations of a character skeleton, so that instead of copy pasting the keyframe of each body part’s movement, I only copy paste from the absolute key.

On the bottom left there should be a key icon where you can register keyframes (for the whole picture).
On the frame where you want to copy your waypoint settings click on the green plus.
Now move to the frame where you want the settings to be the same and click duplicate to. (Make sure the correct keyframe is selected)