Using the Analytics tab under the Reporting menu, can give you a very detailed breakdown of your traffic. Allowing you to optimize your campaigns. When searching by Sub ID you can see a full list of SourceIDs that have sent you traffic, as well as choose to search by individual sources.
SourceID and Sub ID are interchangeable in BidVertiser. Both refer to the identifier for which publisher the clicks are coming from.
You can then use the information provided here to remove poorly performing sources from your campaign.
For example, if you have not received many, or any, conversions, you could remove the top 2 sources, and try some of the smaller sources that you may not have been as exposed to.