When you create an Opportunity in Sugar you will assign a number of items to each Opportunity, such as Account Name, Sales Stage, Amount and Lead Source. When used out of the box, Lead Source contains a range of common items such as Cold Call, Conference, Trade Show, Web Site, Word of Mouth and so on. However it is quite likely that you will want to add your own items to this list to enable you to accurately track the volume and value of leads coming through from each source.