Is there a way to filter and edit expense transactions within current year that have NULL value in Payee Field?

Hello @classicpandp,

Welcome aboard to the Community. Let me share some steps so you can filter expense transactions in QuickBooks Online.

For transactions without a payee, I recommend running the Transaction List By Date report. You have the option to filter the report to only show non-specified transactions.

Here's how:

1. On the left navigation bar, click Reports.
2. Scroll down and select Transaction List By Date.
3. Click Customize.
4. Choose the date range.
5. Press the drop-down arrow next to Name.
6. Select Not Specified.
7. Hit Run report. 
8. Click the expense transaction. 
9. Add the payee information.
10. Press Save and close.

Additionally, I recommend visiting the following article to learn more about how to personalize reports in QuickBooks: Customize reports in QuickBooks Online.

Please know that I'm just a post away if you have any other questions related to your expenses in QBO. Take care.