Manage Customers and Income

Thanks for responding.

I'm not talking about custom fields - which I find restrictive in that there are only two allowed to be active at any one time.

I'm referring to the actual names given to fields within the structure of the database. For example if one wants to personalise a system email one can add [First Name] or [Full Name] or a few customer fields:

I want to know if I can add other fields from invoices (example, document total; special fields like Class or Location within the body of the mailer.

Thanks

George