If, for any reason, the project is canceled or you no longer need to order products, you can delete a purchase order (PO) in the Draft or Draft Completed status. Deleting is permanent; you cannot retrieve the deleted PO.
When you delete a PO, the products in the PO are moved to the "Ready to Order" item status and can be found in the "Procurement > Ready to Order" tab in the left navigation menu.
To delete a PO, go to "Procurement > Purchase Orders" in the left navigation menu. Click the 3-dot menu in the PO tile or row and click "Delete."
If you want to download a copy of the PO before deleting it, check out this article.