It's my pleasure to help you, Big-Al.
You're almost there. The built-in search feature in QuickBooks Desktop is the most convenient way to locate invoices. I'll help you find it.
Here's how:
- Enter the invoice number provided to you in the search box.

- A search box window will appear, enter the exact amount of the payment you receive in the Amount field.

- Click Go button.
- After that an invoice transaction will appear.
- Hover your mouse to the invoice, then choose Receive Payment to record the payment.

For your reference, you can read this article to guide you in recording payment: Record an invoice payment.
In addition, I've included the following resource to view the list of reports available in QuickBooks Desktop: Understand reports.
Let me know if you need anything else. I'll be around to help you. Have a great day.