(1) A change in or addition to a tariff shall be known as an amendment, and, excepting amendments to tariffs of less than five pages, and amendments to tariffs in loose-leaf form, shall be published in a supplement to the tariff. When an amendment is made in a numbered item, or other unit, such item, or other unit must be published in a supplement in its entirety as amended. When rates are published in numbered items, cancellation shall be made as prescribed in ARM 38.3.2801. When rates are published in numbered units other than item numbers, supplements changing matter must specifically provide for the cancellation of such matter by reference to the number of the item or other unit that it cancels. When such a change is made in matter published in a supplement in a numbered unit other than an item, the new supplement must also give reference by number to the previous supplement. In those instances where matter is not published in numbered units, the changed provision must be published in the supplement in its entirety and reference must be made to the page or pages of the tariff on which the matter to be cancelled is shown. If such matter has been cancelled by a previous supplement, specific cancellation must be made of the corresponding matter in the "tariff as amended" and specific reference shall be made by number to page or pages of the previous supplement containing the matter to be changed, and to the page or pages of the original tariff formerly containing such matter corresponding thereto.

(2) The matter contained in each supplement shall be arranged in the same general manner and order as in the tariff which it amends and when stations in a tariff are given index numbers the same index number must be assigned to the same station in all supplements to the tariff.