When you work with Freelancers on Flow, you can issue purchase
orders and include the PO number for reference on the invoices
generated on Flow. You can add a PO number to specific invoices
or to all future invoices generated in a WorkRoom.
Once you add a PO number to a WorkRoom, all future invoices generated in that WorkRoom will automatically include the PO number specified.
You can individually add a PO number to specific invoices, as per your requirement.
Issue Purchase Orders to Flow.com If you are working with a large
number of Freelancers on Flow along with other members of your
organization, you can simplify payments by receiving a consolidated
invoice. In case of a consolidated invoice, the PO may be issued to
Flow.com. This feature is only available to Flow Enterprise users.