Hi Vinner45,
The VB account with another domain name is
yourmaindomain
You can go to cPanel >Addon Domain and add aucklandmenus.co.nz as an "addon domain" to your existing VH hosting account.
You have to point aucklandmenus.co.nz to your VodaHost servers from the cPanel of the other hosting service.
There are a lot of threads on this subject. Just follow the below link
http://www.vodahost.com/vodatalk/domain-names-dns.html
Secondly you can also transfer your newdomain name to VodaHost by submitting a support ticket. VH provides you with one free transfer. This will make your life easier, which is what I did for my addon domains.