Hi Aditya,
It's not complicated one. You have to maintain "Hierarchy Authorization" in RSECADMIN-->Maintenance Tab-->Hierarchy Authorization. You have to select your Hierarchy nodes.
Finally you have to call these Authorizations in your 5 roles.
Create Hierarchy Node variable in your query processed by Authorization.
Please search for a doc on "Maintaining Roles and Authorizations in BI7.0 -RSECADMIN"
Regards,
Suman