Hi,
Consider if possible. If Roles can be accessed by application like user portal, we can set access to page in a centralized place.So admin can change page access on the fly.
Sekar, you have a Role entity under the System component. You just need to add references to it.
Roles are granted to users through User_Role entity (direct grant) or Group_Role (roles inherited from groups that the user belongs to). You can freely insert and delete rows in these entities, and this will reflect directly on the users' privileges.