I'll take note of your feedback so we can improve the services and experience that we can offer to you, @treasurer91. 

Your satisfaction means everything to us. So, I'll route you to a page where you can post feature suggestions. This way, our engineers can find a scheme about the customers and vendors with the same name.

Here's how: 

1. In your QBO account, go to the Gear icon on the upper right side. 
2. Click Feedback under Profile.
3. Type your suggestion in the box and tap Next. 

Your valuable suggestion goes to our Product Development team to help enhance your experience in QuickBooks.

Additionally, I'd recommend visiting our blog site. That is where we share recent happenings and future developments, such as updates to newly added features. 

Lastly, I've added an article that helps you import, delete, merge, and add sub-customers: Add and manage customers in QuickBooks Online.

I'm always here to work with you again if you have other questions about handling your customer information. I hope all is well.