Thanks for joining the thread, @whiche1295. Let me clarify things for you. 

In QuickBooks Desktop, you can use the Add Job option to set up a sub customer. To get started, you can follow the steps provided by my colleague @Rejeil_O. You can also check this article for more information: Tracking job costs in QuickBooks Desktop.

You'll want to know how to manage customers in QuickBooks Desktop. Feel free to check out this article: Create a customer group in QuickBooks Desktop.

I'll be keeping an eye out for your response. Know that you're always welcome here if you have further concerns. Have a good one.