How do I generate a Transaction Report by Expense?

I'm glad to guide you through the steps on how to run the report that you need, camille.

You can run the Transaction List by Vendor, then customize it to see all your expenses. Here are the steps you can follow.

1. Go to Reports from the left menu.
2. Proceed to the Standard tab.
3. Enter Transactions Lust by Vendor in the Find report by name box.
4. Click it from the list to open the report.
   
5. Change the Report period when needed.
6. Click Customize, then proceed to the Filter section.
7. Mark the Transaction type box, then choose Expense.
   
8. Click Run report.

You can save this report so you won't have to go through the customization again. Check out this guide for the detailed steps: Memorize reports in QuickBooks Online.

Also, there are several reports you can use for your business. However, the availability will depend on what version of QuickBooks you're subscribed to. 

Please browse this article to learn which report you can run on your account: Reports included in your QuickBooks Online subscription.

Keep me posted if there are other reports that you need for your business. Just leave a comment below and I'll get back to you.