Hi there bbomber,
It's important that all your transactions re correctly entered for your books to be well balanced. QuickBooks Desktop is a great tool able to help you create and send invoices to your customers so they know the balance owed to you for your services. I can point you in the right direction for assistance with payment terms for invoices.
For assistance with setting payment terms for invoices, I recommend reaching out to the QuickBooks Desktop support team outside of the Community. They'll be able to assist you with customizing the payment terms to have them set up in the way you wish or help find an alternative to make sure your invoices are correctly entered. You can reach them using the options provided in the QuickBooks Desktop software support policies.
If you have any other questions, feel free to reach out here.