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Hi Randy,
We can add multiple domains in one office 365 subscription. However, we can only use one of them to our public website. Therefore, you may need another office 365 subscription for the new domain.
Besides, you may contact OLSB support for more detailed information. Thanks.
https://support.smallbusiness.officelive.com/default.aspx?&st=1&wfxredirect=1
Best Regards, Alex Du
How are things going on your side? If you need futher assistance, please let me know. Thanks.
Best regards,
Alex Du