Copy 1 axis in motion graph

[GHOSTYMPA]

It would be awesome if we could be able to copy one axis from the motion graph of bezier keyframes so we can transfer for example only the y axis or x axis or z axis

[Víctor Paredes]

If I understand well, you can right click over the channel icon and press 'Separate dimensions'.
You can also copy and paste bezier values (or any channel values) between different keys.
A tip: If you want to copy the bezier handles information only, you can copy the keyframe and then use 'Paste relative' instead of normal 'Paste'.

[GHOSTYMPA]

Very helpful, thanks!