To display information about the invoice payment selection and purchase order number on the order details and order confirmation pages, you need to make changes to the corresponding layouts.
To update the order details page:
Open the Order Details Layout.
Switch to grid view.
Replace the Order Details widget with the Order Details with Additional Info widget.
Publish your changes.
To update the order confirmation page:
Open the Order Confirmation Layout.
Switch to grid view.
Replace the Order Confirmation widget with the Order Confirmation with Additional Info widget.
Publish your changes.