Old invoices after Conversion

Welcome to the Community, @cmbusch01. I appreciate the information you've shared. 

This thing happens when the payment is disconnected during the migration process because of the two softwares' different interfaces. 

Since everything matches with your data, you can manually mark the invoices as paid through the receive payment feature.

First, ensure that your invoice payments (deposits and Journal entries) are in the Accounts Receivable (AR) account to link it with the the open invoices.

Then, we can now proceed in making a receive payment transaction:

1. Go to + New, then choose Receive payment.
2. Choose the Customer in the dropdown.
3. A list of invoices will appear.
4. Tick the box beside DESCRIPTION to select all of the invoices.
5. Click Save and new.
6. Repeat this process for all of the customers.

Additionally, you can refer to this article to personalize your sales forms: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Let me know if you need further assistance in marking your invoices as paid after converting to QBO. We'll be here 24/7 to help you.