All standard and default invoice templates are set to pick up your agency address as set in the Agency Details area of your system (Reference Data menu) and each site has provision for one address only. If you have a different office in another town or country for example the options would be as follows:
1 - To purchase a second Etz site that would be completely independent to your original site. As Admin User you would have access to both sites.
2 - Bespoke Invoice Templates - we could create special invoice templates for you but you would need to ensure you have each client set to pick up the correct address/template.
Both options above have cost implications so please log a support ticket and a member of the team will be able to provide you with more information as per your specific requirements.