How do I easily add all my clients to one group?

I'm thinking it's an ability in nsradmin where I select clients and update
the group attribute, but I can't get the coding right.  I started doing this
manually in the GUI, but I have over 250 clients and this probably won't be
the last time I'll want to do some mass group editing.  I tried in the GUI
to select all my client and drag them to my new "All" group, but it didn't
work, despite this being noted as an ability in the GUI.

Any input is greatly appreciated.

-Tom

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