I appreciate the time and effort you've spent with one of our technical support agents, MTCLLC.
I know how beneficial to search for a customer's Purchase Order number is to your business. I'll take note of this and personally share feedback with our product developers about this one.
You can use the workaround you came up with to find the customer's P.O number. Then, manually enter them in the invoice's Description column or Custom fields for your reference.
To learn more about purchase orders, just refer to these articles:
Visit the Community if you need help with filing the year-end forms or any QBO related. Wishing you and your business continued success in all that you do.
