Progress invoicing (also known as progress billing) lets you invoice for
jobs that you work on and complete in phases.
When using progress invoicing, you start by creating an estimate for the job
(you don't have to give this estimate to the customer). Then, as you
complete each phase, you can easily transfer items from the original estimate
to an invoice. You can specify which items to include on each invoice and
change estimated amounts or percentages.
When you use estimates to create progress invoices, you can run reports to
help you track your estimated versus actual costs.
for progress invoicing