Animation Favorites - parameters reference
Parameters and constraints that were animated or nominated as favorites occupy the Animation Favorites folder. Their presence in the folder enables the special animation double-click behavior described here.
Set the timeline to the position you want. double-click the animation favorites node for the parameter you want to animate. Specify the parameter “end” value. A new action is created at the current time position beginning from the previous action. If the edit is performed during a time position when the animated parameter is updating the action is split into two actions.