This worked for me...
1 - Bring up the setting you want to copy and select it to make it active.
2 - Use the shortboard and move to the location where you want to store the copy.
Important: DO NOT press any of the shortboard's A,B,C, or D footswitches, I repeat DO NOT press the footswitch.
3 - Press and hold the corresponding A,B,C,D channel button on the AMP.
4 - Wait for the amp light to cycle red to green back to red
5 - Release the AMP button.
6 - Your setting was just copied (and your original should still be intact.)
Give it a try. Hope that helps.
Example:
To copy 1A to 3B, select 1A, use the footpedal to move to bank 3, DO NOT use the pedals A,B,C,D buttons, then press and hold the AMP's storage button until the light sequence says it's stored..