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Hi there, @solutionsofsolom.
You can create another invoice to add the expense transaction. Let's ensure that the date is the same as the old invoice.
For the detailed steps about the process, please click this article: Create invoices in QuickBooks Online.
Also, I'm adding this article on how to record and categorize invoice payments in Quickbooks.
I'll jump right back in to assist if you need anything else. Wish you all the best.