PRO FORMA invoices
If you wish to send a customer a PRO FORMA invoice, here's how to proceed:
Print format creation
From the Offers file, create a new print format, for example by duplicating the usual offer format. Name the copy of the format "PRO FORMA Invoice".
Modify the "Invoice PRO FORMA" print format and in the format editor, replace the expression "Offer" with "PRO FORMA".
Pro forma invoice generation
Create an offer rather than an invoice and print it using the "Invoice PRO FORMA" format.