Here you can customize the text displayed on proforma invoices. You can also configure the numbering format and define messages shown exclusively on proformas.
The numbering rules for quotations are the same as for regular invoices. You can read more in the invoice settings section.
A proforma can be easily converted into an invoice. Simply select a proforma from the list and right-click to open the context menu. Then choose the Convert to Invoice option. This will open the invoice details dialog with a new invoice that includes the same items and totals as the selected proforma.