To set an animation layer to Additive mode
To set an animation layer to Override mode
The layer name displays in bold to indicate it is in Override mode. The animation in this layer now overrides animation affecting the same attributes on layers above it in the stack.
To set an Override animation layer to Passthrough mode
The animation layer is now in Override-Passthrough mode and you can adjust its opacity. For more information, see "Override-Passthrough mode" in Animation layer modes.
To set the layer Accumulation modes
See the Rotation Accumulation and Scale Accumulation options in the Animation Layer Editor menu bar Options section.