How do I register a customer who is already a supplier, using the same name?

Please note that you can add a distinct character to a customer's name when entering them inside the program. This way, you won't encounter errors because the system detected identical names for a customer or vendor. These are the steps:

1. Access your QuickBooks Online company.
2. On the left navigational bar, click the Sales tab and select Customers.
3. Select New customer.
4. In the Customer display name field, enter the display name with a special character for your customer.
5. Review each section and enter any other important customer info.
6. Select Save.

I'd also recommend checking this page for more information: Add and manage customers in QuickBooks Online.

Furthermore, here's an article to learn more on how to deal with barter transaction inside the program: Record a barter transaction.

I'll always be here to assist you with QuickBooks-related concerns or require a helping hand managing customers inside the program. You can drop a, and I'll be around. Keep safe.