You simply have to publish AA BB and CC to different items and then let each client subscribe only to the items it is interestred in.
As an example you can see this demo
http://demos.lightstreamer.com/StockListDemo/subscribes to items 1 to 15, while this one
http://demos.lightstreamer.com/jqGridDemo/ subscribes to item 1 to 10. Obviously any combination is possible
Does this answer your question?