Hi gtramble,

Glad to hear from you again. I hope all is well on your end! I'd be happy to give you a hand with setting up default payment terms for your customer. 

QuickBooks is a robust program which offers a variety of features which help save you time. Based on what you've described, I recommend referencing the following article which shows you how to set up payment terms on your account for your customers: Set up payment terms.

The answer to your question depends on the template you're using for your invoicing. Normally,  there's a check box for terms and conditions and a box to enter details when setting up the terms.

 In case you need further assistance, feel free to contact our support team using this link here. Otherwise, feel free to leave a comment below, I'll be on standby.