19 C.F.R. § 10.774
(a) Items included. For purposes of § 10.770(b) of this subpart, the words “direct costs of processing operations”, with respect to a good, mean those costs either directly incurred in, or that can be reasonably allocated to, the growth, production, or manufacture of the good in the territory of one or both of the Parties. Such costs include, to the extent they are includable in the appraised value of the good when imported into a Party, the following:
(b) Items not included. For purposes of § 10.770(b) of this subpart, the words “direct costs of processing operations” do not include items that are not directly attributable to the good or are not costs of growth, production, or manufacture of the good. These include, but are not limited to: