Jensen forces you to put all of your websites (and landing pages) into groupings called 'Networks'. Networks can be made up of similar niche sites, similar billing structures or really for any reason you'd like to group sites together.
At the Network level you'll be able to see aggregated statistics of all of the sites within the Network and add new sites (Jensen sites, Js Snippet sites, WP sites).
Billing happens on a per site level, so don't worry about adding sites with different billing cycles in the same network.