CE - Toolbar: Copy and Paste
Click on the small triangles to open the icons' context menus:
Copy Selected Keys
Copy all selected keys to the clipboard.
Copy Curve
Select an entry from “Curves” and copy its curve to the clipboard.
Paste Combined
Mix the copied keys from curve A with the keys from curve B.
Paste Combined on Current Frame
Mix the copied keys from curve A with the keys from curve B at the timeline slider's position.
Paste and Replace
Replace the keys from curve B with the copied keys from curve A.
Paste and Replace After Timeline
Replace the keys from curve B with the copied keys from curve A at the timeline slider's position.
Paste and Replace on Current Frame
The first key of curve A will be inserted at the timeline slider's position overwriting all previously existing control points from curve B.