Please note: only users with the "Edit task lists" permission can assign roles.
Once your roles are setup you can start assigning them to task lists. Users assigned a role will only see the task lists that their roles are associated to. Roles can only be assigned to task lists (the highest order of a list), and cannot be assigned to individual categories or tasks.
This feature is not applicable to users with the "Edit Task Lists" permission, as these users will see all task lists regardless of roles assigned.
To assign roles to task lists: