When you need a Deposit from your Customer to get a job started, and they need a paper that says "Invoice" so they can cut you a check, you have two options:

Proforma Invoice Instructions

2. Print a clean copy of the Sales Order with the word "Invoice" at the top (which has absolutely NO journal posting activity and is not trackable on AR Receivables Aging report).

When do you want to declare the revenue: before the job has even started, or at the end of the job? 

This video covers the method of Printing a Proforma Invoice and the prerequisite of setting up the Proforma Language in the Admin > Languages area.

If you are unable to view the video above, please click HERE