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Since the invoice is partially refunded, you can create a refund receipt in QuickBooks. It will automatically debit the revenue tied to the items you refunded.
See this article for detailed instruction: Record a customer refund in QuickBooks Online.
You might also want to read this article to learn how to manage and view your sales transactions: View Sales Transactions.
Feel free to leave a comment if you have any other questions in mind. I'll make sure to get back to you as quickly as I can. Take care always.