Bind9 Master Slave replication

I have Bind9 on Debian for NS1 and NS2
They are two virtual machines.

I create a file /etc/bind/zones/db.domain.com
Then I have to add this to the /etc/bind/named.conf.local

zone "domain.com" {
type master;
file "/etc/bind/zones/db.domain.com";
allow-transfer { THE.IP.OF.NS2; };
allow-update { none; }; };

Then when I do a reload I it works on NS1, but Have to go into NS2 and also change the /etc/bind/named.conf.local

zone "domain.com" {
type slave;
file "/etc/bind/zones/db.domain.com";
masters { THE.IP.OF.NS1; };
allow-transfer { none; }; };

From now on when I do a reload/restart on NS1 it replicates the /etc/bind/zones/db.domain.com to NS2.

Is there a way to repilcate the content of /etc/bind/named.conf.local to the Slave, so I dont have to add every time the new domains on ns2 by hand?

Thanks!