I'll share some information when deleting a customer record, ray3.

You'll want to let our product team know how deleting a customer in QuickBooks Online (QBO) will benefit your business needs. You can go to our Customer Feedback page. Then click the Give feedback option to submit a request. I've added a screenshot for your visual guide:

Furthermore, QBO offers a variety of reports that caters to your business needs. You'll just have to customize them to make sure you'll get the information you need most. Go through this article for more details: Customize Reports in QuickBooks Online.

Please get back to us if you have any questions about deleting the customer or vendor list in QBO. We'll always be right here to help.