How to create Hierarchy Structure in Openerp?

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I want to create a hierarchy structure in open erp such that :

(Super Admin > Human resources Manager > Human resources officer > Human resources employee)

1.Super Admin Super Admin can view the details of all the employees.

2.Human resources Manager When an Hr Manager logs in ,he should be able to view and edit details of all his officers and their employees as well.

3.Human resources officer When an Hr Officer logs in ,he should be able to view and edit details of all his employees.

4.Human resources employee When an Hr Employee logs in ,he should be able to view only his related user details. He may view the details of all other employees but he can edit only his details.

I am not able to implement this structure in openerp . Please help.