In the case of a controlled group, the 2,000,000 barrel quantity specified in subparagraph (A) shall be applied to the controlled group, and the 60,000 barrel quantity specified in subparagraph (A) shall be apportioned among the brewers who are component members of such group in such manner as the Secretary or his delegate shall by regulations prescribed. For purposes of the preceding sentence, the term “controlled group” has the meaning assigned to it by subsection (a) of section
1563, except that for such purposes the phrase “more than 50 percent” shall be substituted for the phrase “at least 80 percent” in each place it appears in such subsection. Under regulations prescribed by the Secretary or his delegate, principles similar to the principles of the preceding two sentences shall be applied to a group of brewers under common control where one or more of the brewers is not a corporation.