I can share some information with adding a credit memo number, @jedwards5682. 

You can use a credit memo to record a return when a customer returns items for which you have already recorded an invoice, customer payment, or sales receipt. 

In QuickBooks Desktop (QBDT), you can customize the template to include the Credit memo number on the page. 

Follow the steps below: 

1. Go to the Customers menu and select Create Credit Memos/Refunds.
2. Click the Formatting tab at the top and select Customize Data Layout.
3. Choose the Header tab.
4. Select the checkbox for Screen and Print for Credit Number.
5. Click OK to save the changes.

You can now go back to the Credit Memo page and enter a Credit No. See this article for more information about adding and removing fields to your credit memo or your other sales forms: Use and customize form templates. 

Refer to the following article for detailed guidance in creating a credit memo or a check in QBDT: Give your customer a credit or refund in QuickBooks Desktop for Windows. That'll also show you how to handle the credit by either retaining it as available credit, by giving a refund, or applying a credit to an invoice. 

Let me know if there's anything else that I can help with your credit memo and or anything else, by leaving a reply below. Take care and have a wonderful day!