You may want to duplicate a keyframe for use further along the timeline. This could be used when you want the object to return to a particular transformation.
Right click on the relevant keyframe and select Copy keyframe from the menu.
Then select the frame where you want the keyframe to go by clicking the relevant point in the tickmarks across the top of the timeline.
Right click and select Paste Keyframe.
Note that you can only copy and paste keyframes for the same object.
Related Topics