Hi wes1,
According to your post, do you want to switch Small Business trial subscription to Enterprise subscription?
If so, since they are in different service families, and we can only manually switch plans at this time. You can refer to “ Switch plans manually (without the Switch plans wizard)” in the following article:
http://office.microsoft.com/en-us/office365-suite-help/can-i-switch-to-a-different-office-365-plan-or-subscription-HA104031833.aspx?CTT=1#_Switch_plans_without
When you contact our technical support team, they’ll help to remove the domain at the back-end, then finish the switch.
If you have anything unclear, you could contact our sales and billing support team which is dedicated to handling this kind of issue and can provide professional assistance. For your convenience, I have provided the contact information as below:
http://office.microsoft.com/en-us/office365-suite-help/contact-support-for-technical-billing-and-subscription-issues-HA103836042.aspx
If I have anything unclear, please feel free to let me know.
Thanks,
Kid Yang