The Controllers toolbar contains the basic tools for working with controllers in Track View. This toolbar is hidden by default; to display it, right-click an empty area of the Track View toolbar and choose Show Toolbars 
Controllers: Track View.
These commands are also available from the Track View Edit menu (and Controller submenu) except for Filters, which is on the View menu.
Interface
Filters-
Click to display the Filters dialog, which you can use to control what Track View displays in the Controller and Key windows.
Copy Controller-
Use this to copy a controller and its animated tracks from a selected object. See Copy Controller.
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Paste Controller -
Pasts the copied or cut controller onto a new object or selection of object tracks. See Paste Controller.
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Assign Controller -
Use this to assign a new controller to an object. All objects have a default controller assigned; use this to change the default controller to a different one. Select the controller track in the Controller window, then use Assign Controller to select a new one. See Assign Controller.
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Delete Controller -
Delete a controller from an object. The controller will be replaced with a default controller. See Delete Controller.
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Make Controller Unique -
Changes an instanced controller to a unique controller. This lets you make changes to the controller without affecting any other object tracks. See Make Controller Unique.
Procedures
To display the Controllers toolbar:
- Right-click the blank area on the Track View toolbar, to the right of the Modify Child Keys button.
- From the right-click menu, choose Show Toolbars.
- Choose Controllers: Track View from the list.