Go to Report > Sales Summary to view summaries of the company sales within the given period.
Finding out best-contributing products and customers will help you shape upcoming sales strategies clearer.

Assign a start and end date for the period, select a list method, and click on "Run report" to generate the report.
 

List by customers 

Your revenue from respective customers will be summarized and displayed in a decreasing order.
 


List by products/services 

Your revenue from respective products and services will be summarized and displayed in a decreasing order.