Programming remote fob for 2001 Chevy Suburban

Have a new fob that needs programmed. Have one that is currently working. May I please have the procedure to do it? Thanks!

Okay I mistakingly put this as a new thread and should have put it in the first thread. Please move.

You may program up to 4 transmitters, using either of the two following procedures:

Transmitter Programming Procedure
Close all the vehicle doors.
Insert the ignition key into the ignition lock cylinder.
Press and hold the door unlock switch.
While holding the door lock switch in the unlock position, cycle the ignition ON, OFF, ON, OFF.
Release the door unlock switch. The doors will lock and unlock to confirm the program mode.
Press and hold the LOCK button and the UNLOCK button simultaneously on one transmitter. After a delay of approximately 15 seconds, the doors will lock and unlock to confirm the programming of that transmitter.
Repeat the previous step to program up to four transmitters.
Turn the ignition switch to the RUN position in order to exit the keyless entry transmitter mode.
Operate the transmitter functions in order to verify correct system operation.

If I do this, will I have to reprogram EACH transmitter that I have or just the new one I just got?

Just wondering if I'll have to do each fob or if I can just do the new one I have.