Thanks for reaching out here in the Community, @parker5095. I'll share some details about entering alphanumeric numbers in the reference field when creating a transaction in QuickBooks Desktop (QBDT).
You're right. In QuickBooks, you can enter alphanumeric numbers in the reference field when creating transactions. Also, QuickBooks has an automatic number system. That said, from the first transaction you enter, it'll start counting, and the numbers will follow consecutively for your reference field. You also don't have to worry about exporting the transactions outside of QuickBooks since It'll still retain the information you entered.
Additionally, I've got you this article to help you handle payments in QBDT: Take and process payments in QuickBooks Desktop.
You can also check this page in case you'd like modify a report to show specific data from your business: Customize reports in QuickBooks Desktop.
Our door is open 24/7 if you need further assistance with this, @parker5095. You can also post here again if you have any additional QuickBooks-related concerns. I'll make sure to respond right away to help you sort it out. Take care, and have a nice day!