Sub-domain delegation for BIND 9.2.3

[Apache Apache]

I have a server (ie. serverA) running BIND 9.2.3 and is a master DNS for 
parent domain company.abc.com. Users are pointing to this server for name 
resolution.

I have another server (ie. serverB using F5 DNS) and I would like this 
server to serve the domain xyz.company.abc.com.

What are the changes required on my named.conf and db.company.abc.com for 
serverA in order for users to be able to resolve host.xyz.company.abc.com???

Thank you.

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