WARNING: It will delete all previously learned commands including the ones learned through the standard method. If you need to learn more than one command (per device) using this fake IR Analysis Center, then you will need another learning remote.
1) Teach an "IR Analysis Center" command to a "sacrifice" device (one command per sacrifice device).
2) Teach the command from the sacrifice device to the proper device on the other remote using the standard method.

You will have to repeat these two steps if you are using only one "sacrifice" device.