Sales By Source Report gives you a visual overview of the sources of your deals. It also maps it against your team members so that you can identify your team performance as well as understand where most of your deals are coming from. This can improve your sales processes by helping you spot trends and patterns.
Go to Sales > Sales By Source
It plots the percentages based on the info you supplied when you added a deal. You can add more source by clicking on the '+' sign indicated below.
You will be redirected to this page where you can add new sources from where you get your Deals or delete other sources.