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You'll want to create a bill to your vendor and categorize the transaction as an expense.
Here's an article for more information and detailed steps: Enter and Pay Bills.
Once done, you can run and customize a vendor report in QuickBooks Online (QBO). Please check this article on how you want your report to show: Customize Reports in QuickBooks Online.
If you have any other questions, please get back to this thread. I'll always make sure to help you.