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Welcome to the Community, @patrick27.
Are you trying to add a customer when creating an invoice? If so, I'm here to get you moving in the right direction and save your work in QuickBooks.
Here's how to create an invoice and add a customer:
I'll include the following resources below for your guide.
However, if you're trying to add a billable expense to an invoice, you can check this article instead: Enter billable expenses.
Please don't hesitate to reach out again if you're referring to something else. I'm here to help however I can. Take care and have a good one.