Import Invoices / Customize Invoices

Import Invoices / Customize Invoices

I have seven Zoho accounts that use the same customized invoice that was Imported into each set of books through cut/paste html per Zoho support advice. 

I have now opened an eighth account and cannot see how to customize my template except through the very, very limited field adjust. Is there a way to cut / paste over an html or to Import the template the other offices use? 

Our systems are uniform and automated and to have one office off cannot occur and will cause a system lag and a labor expense. 

Please advise. I find it difficult to believe that such a restrictive change would occur within the Zoho system given the push by Zoho for the ability to "customize" invoices is what brought us here.