Add additional domains
Some districts use multiple domains. With Google Apps, you can manage multiple domains through a single administrator control panel. These settings are available in Domain names under the Domain settings tab of the administrator control panel.
To learn more about setting up Google Apps with multiple domains, see http://www.google.com/support/a/bin/answer.py?answer=182452
There are some limitations to using multiple domains, which you can read about here.

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