Section 100(4) in Greater Hyderabad Municipal Corporation Act, 1955
(4)The Corporation, may from time to time, with the sanction of Government enter into an agreement with a local authority or with a combination of local authorities for the levy of octroi or toll or any other tax by the Corporation on behalf of the bodies so agreeing and in that event the provisions of this Act shall apply in respect of such levy as if the area of the city were extended so as to include the area subject to the control of such local authority or such combination of local authorities.Provisions regarding validity of proceedings.