I remember there being a post somewhere about GG codes so I thought I would share a few I have come across:

ADD UA MILEAGE PLUS MEMBERS NOT ON STANDBY LIST
EX: 6:123-DOE/JOHN$UPG+U

ADD UA GLOBAL SERVICES/1K COMPANIONS TO STANDBY LIST
EX: 6:123-DOE/JOHN$1KC+U

ADD PREMIER EXECUTIVE COMPANIONS TO STANDBY LIST
EX: 6:123-DOE/JOHN$P1C+U