Make Controller Unique converts an instanced clone of a controller to a copy that's unique to the current object. Objects and modifiers can also be made unique.

(Make Controller Unique)The result depends on whether or not the data flow branches at the selected container:
All the Controller tools can also be found on the Controllers toolbar, which is hidden by default. Right-click any blank area of the Track View toolbar, then choose Show Toolbars > Controllers: Track View to display the buttons for Assign, Copy, Paste, Delete Controller, and Make Controller Unique.
To convert an instanced controller to a unique one:
Highlight an instanced controller.
On the Controllers submenu of the Track View Edit menu, choose Make Unique, or press U on the keyboard.