Any key already assigned a macro will activate the macro in every device. Unless:

If you want to reclaim a macro key for one or more of your devices, but leave the macro on all the others, you can use any 994 sequence including

- reseting the key to it's original function:
DEV SETUP** 994 key key
- mapping another key to that key:
DEV SETUP** 994 (sourceDEV) sourcekey destinationDEV) destinationkey
- assigning an advanced code to the key:
DEV SETUP** 994 SETUP (sourcedevice) three digit advanced code (destinationdevice) destinationkey

I've been there and done that.

Dave