To add a Purchase Order to a booking:
To do this go to the Clients tab – locate your client & click View – Click on the relevant booking – Click 
at the bottom of the page.
At the top of the Bookings form you will see the following:
From here you can enter the Purchase order number – this will appear on the invoice.
Any bookings that have a purchase order against them will appear on a separate invoice to different Purchase Orders or bookings without a Purchase Order.
If a booking has already been invoiced, the above steps can still be done and the PO number will be immediately visible on the invoice which was previously created.
