You create new animation in Absolute layers. Absolute layers include CATMotion and absolute (keyframe animation) layers, as well as imported motion data, which you load into an absolute layer.
Before you can start animating you need an absolute layer to create your animation in.
To create an Absolute layer:
An Absolute Layer is created in the Layer Manager list.
You are now ready to start keyframing.
Assign new animation layers as you need them. It is useful to break your animations down into manageable segments.