NEW! Create GMAIL Contact Groups, which are now called LABELS.
With this new way to add people to a Label, you can easily add a person to multiple Labels at the same time. You can also easily move them from one Label to another Label at the same time. When their Contact Card is open, put a check by all the Labels that you want them added to. If you're changing them from one Label to another, uncheck the old Label and put a check by the new Label.