Thanks for joining this thread, hbint.

The ability to add the P.O number into your email is unavailable in QuickBooks Online (QBO). As a workaround, you can manually add it to the body of your email every time you click the Save and send button in the Purchase Order window. I'll show you how:

1. Locate a Purchase Order transaction.
2. Click Save and send.
3. in the Send Email window, add the P.O number.
4. Click Save and close.
   

Your customer will then receive the email with the P.O number in it.

Let me know if you have other questions, I'm here to help.