Thanks for reaching out to the Community. I'd be glad to answer your question about adding a customer who's also a supplier in QuickBooks.
At this time, QuickBooks doesn't allow you to add a customer with the same name as a supplier. A common workaround is changing up the name by wither adding a number or a symbol in the name. Doing this will allow you to keep track of the same supplier/customer with ease.
If you need help with this, don't hesitate to reach out. I'll be here for help.
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