DebSheenD (QuickBooks Team replied to me about the addition of a Customer Purchase number and to appear at job entry, invoice and Packing list. I replied but there was a authorisation error and all was lost

Can you help please Customer PO is the primary  contact mode and must appear on any correspondence  or job related questions. It must appear on each invoice for Accounts payable reconciliation and on the Packing list for Goods receipting on deliver to customer warehouse. How can a PO be added as a regular field ? It is a fundamental item required by customers to complete thge billing and delivery cycle.