I appreciate your time getting back to us, @Susan1216. I have details regarding how the transactions are sorted with the current customization settings.

I understand how it would make your work easier if we can customize the number according to your format or reference. However, this is currently unavailable. 

The PO number is a unique reference number assigned to every purchase order. By default, QuickBooks automatically handles creating and tracking transaction numbers. When a new transaction is created, QuickBooks looks for the last transaction number and simply adds one. This system ensures that all of your transaction numbers are in sequence and that there are no duplicates.

In the meantime, you'll want to change the numbers manually.  Then, select Keep Number so it remains the same. 

See this article to learn more about tracking the items you order and receive: Create purchase orders in QuickBooks Desktop. You'll also want to consider my colleague's suggestions above to use and customize form templates. This way, you can control the layout and include the information you need.

Here's a reference that will guide you how to resolve template issues in the program: Fix common issues when you use and customize templates.

Click the Reply button below if you have follow-up concerns regarding purchase orders or other inquiries. I'll gladly help. Take care.