N.Y. Alternative County Government Law § 54

§ 54. Modification of alternative form after adoption. A county which\nshall have adopted an alternative form of county government may, in like\nmanner and with like approval of the electors of the county, as provided\nby this chapter for submission and adoption of an alternative form of\ncounty government, supplement the form of government theretofore\napproved by adding thereto any provisions which might have been adopted\noriginally or delete or change any provisions of the form so as to leave\nit in a modified form which could have been adopted originally, and the\nform of government as thus modified shall, from and after the time it\nbecomes effective, have the force and effect of, and be deemed to be, an\nalternative form of county government.\n