I subscribed my account from Singapore to be used in Myanmar. On invoice, i can't change country name in address bar. And also although i created a custom tax name, it just show as GST total under subtotal line on Invoice. Since i am using quickbooks in Myanmar, those names "Singapore" in address and "Total GST" under subtotal lines are making me difficult to deal with my Myanmar Tax Officers.
When it comes to your current QuickBooks Online (Singapore) subscription, you'll need to cancel this out so you can start with a new account. In doing so, you may reach out to our Customer Care Team. They have the tools to check on our subscription and transfer your information from one account to another and provide you with more details about its fee.
On the other hand, in transferring your company data this can be done through the export and import procedure as mention by my peer above.
Lastly, I've added here some resources that you can count on with changing an address and tax names: