You can use Copy and Paste to copy object and modifier tracks, controllers, objects, and components, depending on what you are working on.
The Controller tools are also available on the Controllers toolbar. This toolbar is hidden by default; to unhide, right-click the toolbar and choose Show Toolbars Controllers: Track View.
Not all tracks can be copied and pasted. The basic restrictions for using Copy and Paste in Track View are:
To copy and paste a modifier:
The Paste dialog opens.
The pasted modifier is inserted above the object track you selected. It does not replace any of the tracks in the target object.
To copy and paste a controller:
Make sure you choose the same type of transform that you copied.
The Paste dialog opens.
The controller is pasted onto the selected object.