Open the Work > Project Management > Project Invoices module.
Click the to expand the Invoice to which you want to add a Purchase Order.
Click Add in the Purchase Orders grid. A new record opens.
Select a PO Number to associate with your Invoice. This is required and must be unique.
Enter a Retainage amount to be withheld from this invoice until the project is complete.
Click Save . The new record appears in the Project Invoices > Purchase Orders grid. Additional fields on the record will populate from the related Purchase Order:
PO Amount = Amount field on the Purchase Order
Previously Invoiced = sum of all Invoiced Amounts from invoices previously attached to the Purchase Order
Invoice Total = sum of all Invoiced Total Costs from this record's Detail records
Remaining Amount = Invoiced Total - Previously Invoiced