check this for about LIST,
http://social.msdn.microsoft.com/Forums/en-US/sqlreportingservices/thread/f7cf2f7d-b103-49f1-a441-9a1bf3225f3b
How add subreport in List Control
Drag and drop List Control from Toolbox into Body
Drag and drop Subreport from Toolbox into List Control
Right Click on Subreport and select properties
In General Tab Select subreport from dropdown
If you parameters in subreport click on Parameter tab and enter parameter NAme & Parameter Value
Click Ok
If you have any other queries please mention exact scenerio you are facing. So that it will be easy to help you