I understand your point of view, Michaelaztax.

Including a Purchase Number field when importing transactions is a brilliant idea. Thus, the transaction is personalized and easy to locate in QuickBooks.

We're constantly searching for ways to make your QuickBooks experience more fun and convenient. While this PO# field is unavailable in the mapping area, I suggest sending feedback to our engineers. This allows them to evaluate your proposal and incorporate it into future releases.

Here's how: 

1. Go to the Gear icon on the upper right side. 
2. Select Feedback. 
3. Type your comments in the box and click Next. 

Also, QuickBooks has a website where users can give feedback and vote on ideas for new features. Follow this link:  Customer Feedback for QuickBooks to get to the page.

Check out these articles below to learn how to import data in bulk and add an accepted purchase order to a transaction for your supplier: 

• Add purchase orders to expenses, bills, or cheques in QuickBooks Online
• Import multiple invoices at once in QuickBooks Online

If you have questions or recommendations regarding QuickBooks, please don't hesitate to mention them in the comments below. I will do everything in my power to be of assistance to you. Take care.