Thank you for reaching back out to the QuickBooks Community, tom-strain. I would be delighted to shed some light on this situation. It won't be possible to make one payment apply to two invoices. However, you could split the payment between the two. Another suggestion you can look at is using sub-customers as an alternative solution. This is a great feature if you want to track customers who are apart of a group or specific accounts for a larger company.
Nonetheless, I highly recommend that you speak to your accountant first about the best way to go about this. If you don't have an accountant, QuickBooks has a service called Pro-Advisors that can assist you. Simply enter your zip code, and browse through all the experts in your area and connect with them. Many even offer free consultations.
Let me know if you require additional help. We're always here to help you. Stay safe.
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