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I'd be glad to show you the payments applied to the new invoice, @useroakandlineninter.
You can pull up Invoices and Received Payments or Transaction List by Customer Report to show the applied credit to the customer. Here's how to do that:
I've added this reference page to know more details on how to manage your customers: Sales and customers Articles.
You're always welcome to tag my name in the comment section below if you have other questions. I'd be happy to assist you further. Take care.