Você precisa usar visualizações:
view "officeA" {
match-clients { 192.168.1.0/24; };
include "/etc/named.conf.zones-rfc1912";
include "/etc/named.conf.zones-common";
include "/etc/named.conf.zones-officeA";
};
view "officeB" {
match-clients { 192.168.2.0/24; };
include "/etc/named.conf.zones-rfc1912";
include "/etc/named.conf.zones-common";
include "/etc/named.conf.zones-officeB";
};