-click the layer and select Empty from the pop-up menu.
All attributes assigned to the layer are removed, and any associated animation curves are deleted. The layer remains in the stack.
To delete selected animation layers
-click the layer(s) and select Delete Layer from the pop-up menu.
The layer(s) and all associated animation curves are deleted.
To delete all keyframes from a selected animation layer
With all of the layer’s associated objects selected, you can view its keyframes in the Time Slider, Graph Editor, and Dope Sheet.