Thanks for replying on this thread, @EZPVC.

Currently, we're unable to turn off the automatic invoice for selected customers in QuickBooks Online. I can see the importance and convenience of being able to turn off reminders for specific customers, so I'll take note of this idea. 

But if the chosen customer is more than the customer who wants you to send reminders, I'd suggest turning off the feature. Then manually send the reminders by going to the Customer's page. You can follow the steps provided by my colleague Maybelle_S above. 

To by-hand, please go along with the steps below. 

1. Go to the Sales tab, then choose All Sales. 
2. Locate the customer's invoice, then hit the small drop-down arrow under Actions. 
3. Pick Send reminders. 

For more details, check out this article: Automate invoice reminders in QuickBooks Online.

I like you to know that your voice matters to us. That said, I encourage you to visit our QuickBooks Online Blog to stay current with our news and updates, including product road-maps. 

I'll attached some articles about handling clients transactions, sales forms, taxes, and other related topics: 

• Sales and customers
• Customize invoices, estimates, and sales receipts in QuickBooks Online

I'm always here if there's anything else you need. Keep safe!