u want 2 know dtails of the hirearchy in civils(IAS).if u bcome an IAS officer first u'll posted as sub collecter in any of districts of state of which cadre u blongs 2.then after completing on job training 4 1-2 yrs u'll b posted as Jt collecter.after that u'll be posted as collecter of district after serving 2-3 yrs as jt collector.collector is head of a district under whom the district admin works.he's excecutive magistrate of the district.eevry dept comes under collector except police as its headed by another all india services officer SP whos an IPS officer.after serving as collector, u'll get promoted to nexst level secretary 2 govt and after tat principal secretary and spl chief secretary and finally chief secretary.think i provided u with required info.al da bst