Good morning, @kperry.

If you have the Invoice # field turned on for your invoices, then in your customer statement, it will be included in the Transaction column. I've provided a screenshot below of an example statement: 

If this is what you're looking for, I can show you how to turn on the Invoice # field on your invoices. In just a few simple steps, you'll have this feature turned on:

1. Go to Customers in the top menu, then select Customer Center.
2. Locate a customer you want to create a statement for and open an invoice to edit the template.
3. At the top of the invoice, click on Formatting and press on Customize Data Layout.
4. In the Header section, mark the checkbox for Invoice Number.
5. Hit OK.

For more information about customizing templates, click here.

Once the invoice # shows on the invoice, create a statement for the customer.

Let me know if you have any additional questions or concerns. I'm always here to lend a helping hand. Take care!