Hi Manny,
Sorry, there is no way to migrate/upgrade from Office 365 Home Premium to 365 Small Business Premium. You need to cancel your Home Premium Subscription and then start a new sign up for Office 365 Small Business subscription.
For more information:
Compare Office 365 for business plans
In addition, you can also contact our Office 365 Home Premium Subscription Team for further support they will provide you more detailed information’s on this issue, please go through the link: http://answers.microsoft.com/en-us/office/forum/office_365hp
Thanks for your understanding.
Best regards,
Shyamal