How to delegate a subdomain to another nameserver

In order to delegate a sub-domain's DNS management to another server, perform the following steps:

1. Set NS records for your subdomain and in DATA field put a nameserver:


sub.domain.com NS ns1.nameserver.tld
sub.domain.com NS ns2.nameserver.tld


2. Then create a new nameserver
sub.domain.com

3. Now you can start adding A records for your new subdomain, like:


sub.sub.domain.com

http://www.itsudo.com/dns/2013/10/27/delegate-subdomain.html