You can create various report related to Expenses,
To create an Expense report
- Go to the Reports tab in Salesforce and
 - Click the New button,
 - Search for Expenses in the "Search Report Types" field
 - You see multiple options for creating the Expense report,
 - Select what details/object you want to see in the expenses report
 - Click the Continue button, and select the fields from the list that you want to see in the report and Save it.
 - Now the report is created and Saved, and you can refer the report whenever you want it.
 
