Apple Motion 3 - Manual (Page 542)

542 Chapter 6 Keyframes and Curves
m Shift-click the keyframes you want to select.
Once you have the keyframes selected, you can cut or copy them to move them to the
Clipboard.
To copy selected keyframes:
m Choose Edit > Copy (or press Command-C).
To cut selected keyframes:
m Choose Edit > Cut (or press Command-X).
To paste your selected keyframes, you must select both the parameter you want to
paste to, and the place in time where you want the pasted keyframes to begin.
To paste keyframes:
1 Select the destination parameter in the parameter list (on the left side of the Keyframe
Editor).
2 Place the playhead at the point in time where you want the keyframes to begin.
3 Choose Edit > Paste (or press Command-V).
If only the curve (and not the keyframes) appear
white, the keyframes are not selected.
Selected keyframes appear white.