I'd also review Appendix B.
iii. Race - Aggregate categories and subcategories. There are five aggregate race categories: American Indian or Alaska Native; Asian; Black or African American; Native Hawaiian or Other Pacific Islander; and White. The Asian and the Native Hawaiian or Other Pacific Islander aggregate categories have seven and four subcategories, respectively. The Asian race subcategories are: Asian Indian; Chinese; Filipino; Japanese; Korean; Vietnamese; and Other Asian. The Native Hawaiian or Other Pacific Islander race subcategories are: Native Hawaiian; Guamanian or Chamorro; Samoan; and Other Pacific Islander. You must report every aggregate race category selected by the applicant. If the applicant also selects one or more race subcategories, you must report each race subcategory selected by the applicant, except that you must not report more than a total of five aggregate race categories and race subcategories combined. For example, if the applicant selects all five aggregate race categories and also selects some race subcategories, you report only the five aggregate race categories. On the other hand, if the applicant selects the White, Asian, and Native Hawaiian or Other Pacific Islander aggregate race categories, and the applicant also selects the Korean, Vietnamese, and Samoan race subcategories, you must report White, Asian, Native Hawaiian or Other Pacific Islander, and any two, at your option, of the three race subcategories selected by the applicant. In this example, you must report White, Asian, and Native Hawaiian or Other Pacific Islander, and in addition you must report (at your option) either Korean and Vietnamese, Korean and Samoan, or Vietnamese and Samoan. To determine how to report an Other race subcategory and the American Indian or Alaska Native category for purposes of the five-race maximum, see paragraphs 9.iv and 9.v below.