In a combining B district, all regulations shall remain the same as in the district with which it is combined, except as to the matters hereinafter specified. Every parcel designated on the zoning map as being in a combining district identified by one of the symbols shown in Column 2 of Table 17.22.030 shall become and hereafter be subject to these regulations for the combining district identified by the symbol shown on the same line in Column 1 of said table, and shall be so shown on any revised zoning map. (Prior gen. code § 8-40.1)