Easy way to specify nodes on multiple domains?

[Nickster]

Dear All,

Is there an easy way to maybe "re-use" zone files to specify exactly the
same host names/IP addresses for multiple domain names e.g.
box1.domainname.org box1.domainname.com? Currently I'm having to duplicate
entries between 2 zone files and it's a bit of a pain. Am I missing
something really obvious!?

Apologies if there is a simple answer, I am a bit of a newbie to DNS/BIND.

Thanks for any help y'all could give,
Nickster