Hi there, @Lawn Laddie.

Let me provide you an update with your question about setting up terms in QBO.

Currently, QuickBooks offers two types of payment terms at this time (Due in fixed number of days and Due by certain day of the month).At the moment, we don't have the exact date as to when will have other terms  to  be added in QuickBooks. 

I understand that this feature will be beneficial to your business, with that said, I'd suggest sending feedback to our developers, so they'll consider adding this option. Simply go to the Gear icon, then select Feedback. 

Additionally, I've added this article to show how you can record invoice payments: Record Invoice Payments In QBO.

You can also check this article for a detailed guide on how to adjust invoice payment terms in QuickBooks. 

Don’t hold back to drop a comment if you have additional questions or concerns with payment terms. I’ll be here anytime. Have a good one!