Where:
(a) an item of a Customs Tariff, or a proposed item of a Customs Tariff, is expressed to apply to goods, or to a class or kind of goods, as prescribed by by - law; or
(b) under an item of a Customs Tariff, or a proposed item of a Customs Tariff, any matter or thing is expressed to be, or is to be determined, as prescribed or defined by by - law;
the Comptroller - General of Customs may, subject to the succeeding sections of this Part, make by - laws for the purposes of that item or proposed item.