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Hi there, ghayward21,

Let me clear things out about creating sub-customers in QuickBooks Online (QBO).

You'll get this error when you have more than two duplicate names under the parent customer. The easiest way to fix this is to use a unique display name even though this sub-customer has the same company name. Please see the attached screenshots below for your visual reference.

Learn more about adding sub-customers in QBO through this article: Manage your customer list. It includes detailed steps and instructions for more details.

Should you need anything else, please let me know. I always have your back. Thank you and take care always!

Best regards,

Mary Land