How i get total expense for certain vendor

Hello there, George. 

You can filter Expenses by Vendor Summary to get the total expense amount for specific vendor. Let me show you how.

1. Go to Reports.
2. Scroll down and go to the Expenses and vendors section.
3. Click Expenses by Vendor Summary.
4. Under the Report period dropdown menu, choose Last Year.
5. In the upper right, click on the Customize button.
6. Go to Filter, and choose the vendor in question under the Vendor dropdown menu.
7. Click Run Report.

Also, you can consider saving the current customization by clicking on the Save customization button in the upper right corner. You can read this article as a reference: Memorize reports in QuickBooks Online

If you have further concerns about reports in QuickBooks Online, feel free to come back here in the Community. We're here to assist you 24/7.