For tracing the expense, I'd suggest running the Expenses by Vendor Summary report to view the transactions. Then customize it to shows the specific parts.
Go to the Reports menu, then type Expenses by Vendor Summary in the search box.
Hit the Customize button on the left side.
Select the appropriate period, accounting method, rows/columns, and filter.
Hit Run Report.
For more information about customizing reports, visit this article: Customize reports.
Also, saving the customization report is helpful too. It will help you save time since it automatically updates every time there are newly added transactions. You may refer to this article: Memorize reports in QuickBooks Online.
Additionally, to know more about how to handle paired or identical transactions in QBO, please visit this article: