Several objects, e.g. picture and video objects allow control tracks to be enabled in order to perform additional functions, such as keyframe control or muting. Information about the actual functions can be found at
Visual effects
Right-click an object and select Control tracks. In the dialog popping up, select the control tracks for the appropriate functions and click OK.
Individual control tracks for Rotation, Position and Zoom to be edited in the Keyframe Editor can only be selected if the corresponding checkmark next to Combined control tracks has been removed.
Right-click some empty space of the control track you want to copy and select Copy.
Right-click the control track you want to paste the previously copied keyframes into and select Paste.
If the object does not have a suitable control track you will have to add one before pasting the keyframes.
Control tracks with keyframes can also be copied and pasted from the Media Pool. See Using pre-defined keyframe effects.
Right-click an object with a control track and select Control tracks. Remove the checkmark next to the control tracks you want to remove and click OK. This removes the appropriate control tracks including all their keyframes!
By clicking Remove all control tracks all control tracks and keyframes will be deleted.