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.
Click
and hold on the Abs button so the flyout opens, and then drag down
to the second Abs button.
Click
the Mode button above the list to switch to Animation mode 
.
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.
