I paid an expense with personal funds and don't need to reimburse it. What is the best way to do this transaction in QBO?

Hello there, pawhouse.

You can record the expense by following these steps:

1. Click the Plus (+) icon located in the upper right-hand corner.
2. Under Other, click Journal Entry.
3. On the first line, select the expense account for the purchase and then enter the amount of the purchase in the Debit column.
4. (Optional) Enter a customer's name to associate the expense with a customer.
5. On the second line, choose the Owner's equity or Partner equity from the Account column. 
6. Enter the amount of the purchase in the Credit column.
7. (Optional) add a message in the Memo field to help you identify the transaction later.
8. Click Save and send.

In the future, if you decide to record the reimbursement, you can check this article for reference: How to pay for business expenses with personal funds.

Please don't hesitate to ask if you have other questions or concerns. We're always here to help. Thanks.