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Buy nowHello Bill1626!
Welcome, and thank you for posting about getting an Internal ID associated to customers.
Know that QuickBooks Enterprise does not create an Internal ID for each customer profile. However, the profile itself has an option to make your own field for ID numbers. I’ll show you how.

The field will then show up in the customer's profile. You can use it to manually input a number for customers.

You can check out the article about creating a custom field for your additional reference.
Please let me know if you have any other concerns about having a customer internal number. Have a good one!