I wish I could add this kind of feature in QuickBooks so you can save your time, @Sarah-Zee.
I know combining multiple invoices into one will help help your business needs and can make the work easier. We don't have a specific time frame for the feature's implementation in QuickBooks.
I'd recommend visiting this link: Customer Feedback for QuickBooks. This way, you can keep up with the updates. In addition, you can voice your opinion about what you would like to see in the future of QuickBooks by going to the company website and voting on suggestions.
As an alternative, I'd suggest following the workaround provided by BettyJaneB or Fiat Lux - ASIA above.
Check out these articles below on how to send invoice reminders and pay your customers directly by credit card or ACH transactions in QuickBooks:
Feel free to mention my name if you have other concerns about QuickBooks. I'd be pleased to assist you. Stay safe.
