19 C.F.R. § 10.197
(a) Items included in the direct costs of processing operations. As used in §§ 10.195 and 10.198, the words “direct costs of processing operations” mean those costs either directly incurred in, or which can be reasonably allocated to, the growth, production, manufacture, or assembly of the specific merchandise under consideration. Such costs include, but are not limited to the following, to the extent that they are includable in the appraised value of the imported merchandise:
(b) Items not included in the direct costs of processing operations. Those items which are not included within the meaning of the words “direct costs of processing operations” are those which are not directly attributable to the merchandise under consideration or are not “costs” of manufacturing the product. These include, but are not limited to:
[T.D. 84-237, 49 FR 47993, Dec. 7, 1984; 49 FR 49575, Dec. 20, 1984]