Make changes in fleet management code canyon script -- 2

I am using this script [login to view URL] I need to make some changes Need to create a hierarchy for login access. Only the higher level can see the lower level My Users->Company-->Managers-->Drivers My Users Can See Every company every manager every driver The company can see Managers and Drivers for that company Ex. Company A has 3 managers and 3 drivers. If you're logged in as the company, you can see the 3 managers' and 3 drivers' data. If you are logged in as a manager, the driver must be assigned to that manager in order for him to have access to data. Drivers can only see the driver information for the vehicle they are assigned to. (THIS IS VERY IMPORTANT TO GET CORRECT) So you have to make 2 new roles, it's not a big task...please bid if you already have worked with this script