(1) In Schedule 3:
(a) either:
(i) 4 digits in the first column; or
(ii) 8 digits in the first column not opposite to a dash or dashes in the second column;
indicate the beginning of a heading; and
(b) 5, 6, 7 or 8 digits in the first column opposite to a dash or dashes in the second column indicate the beginning of a subheading of the heading in which the digits appear.
(2) In this Act or in any Act that amends, or in any Tariff instrument that relates to, this Act:
(a) a heading may be referred to by the digits with which the heading begins; and
(b) a subheading of a heading may be referred to by the digits with which the subheading begins.