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Hi there, @shwimer.
I can help walk you through the steps on how to change the transfer transaction into expense in QuickBooks Online.
If this online banking and isn't yet in your bank register, you can follow the steps below on how to update the transaction.
The transaction is moved to the register and assigned from the For Review tab to the Categorized tab.
But, if the item is already in the Categorized section, you'll need to Undo to update the correct category.
For more details, check out this article: Unmatch or move bank transactions after reviewing them.
However, if recorded this manually, you can delete it and manually re-create the transactions as an expense.
I've included these articles below about handling bank transfers and categorizing transactions in QBO:
Additionally, you can always visit our help articles page. This page contains steps for your future tasks like accessing different reports, customer/vendor data, etc.
Please know that I'm just a post away if you have additional questions about updating the bank category. Have a good one.