Why has this issue not been resolved.    It has been going on for years and they have said since 2020 that they would look into fixing this.   

Your input is valuable to us, Scott2024. I know you've been waiting for this feature to be available in QuickBooks Online. Let me hop in to provide additional information about this matter.

Paying the entire customer statement isn't supported in QuickBooks Online. However, we can only process and pay invoices on an individual basis. This means you’ll need to review each invoice and make payments separately to ensure accurate tracking and accounting.

I encourage you to submit your feedback to our product developer. Sharing your suggestions is a valuable way to ensure your voice is heard, and it can help shape future updates and improvements to the product. 

Here's how:

1. Go to the Gear icon and select the Feedback.
2. Enter your product suggestions. 
3. Click Next to submit them.

Alternatively, you can look for a third-party app that supports this function. Please visit this page: QuickBooks App Center. By using QuickBooks Online Application, you can save time and simplify your business operations. These apps allow you to automate your invoicing procedure, and share business data in one place.

Moreover, you can refer to this page if you need to delete, edit, or add a sub-customer: Add and manage customers in QuickBooks Online.

I appreciate your dedication and patience as we strive to improve QuickBooks Online. If there's anything specific you’d like to accomplish or any feedback, you are welcome share your thoughts in the Comment section below.

Very clearly making a suggestion doesn’t help.  This suggestion started 4 years ago and nothing has changed.    Very disappointing that you keep replying to make suggestions but do not make the suggested changes that make sense.   I for one am already looking into another accounting program as QuickBooks clearly is not concerned with their customers needs and requests.