Wherever, by any provision of this Charter, it is prescribed that any power, duty or procedure shall or may be exercised, performed or adopted in the manner established by any law of the State of Arizona, such power, duty or procedure may, nevertheless, be exercised, performed or adopted, or caused to be exercised, performed or adopted, in the same or in a different manner, by an ordinance of the Council, irrespective of such State law, and in case there be no procedure established by State law therefor, then the Council shall by ordinance prescribe one.