I have a domain (e.g. mytakeaway.com) on a Plesk 9.5 Linux server. It's got a site associated with it currently.
I'm using a 3rd party ordering system (to be housed within an iframe), which I need to supply a domain for. I want to use ordering.mytakeaway.com for this. I've been given the nameservers (e.g. ns1.serviceprovider.com and ns2.serviceprovider.com) which this subdomain needs to point to, but I'm not sure how to set it up - I've only ever set up simple subdomains with a direct IP before.
I've not been able to uncover much info online (partly because I'm not sure exactly what I want!), hopefully someone here will know better!
Edit: Ok, going to try and explain a bit better...
I have a domain, say mytakeaway.com set up on my server, hosting the main site on the same machine.
I'd like to create a subdomain, ordering.mytakeaway.com, which will be used for a 3rd party ordering system. The 3rd party have their own servers for this service, and on these an account set up for "ordering.mytakeaway.com".
I need it so that if someone accesses ordering.mytakeaway.com (which would initially come to my server), that it then looks up the correct server to redirect to from the 3rd party nameservers.
Kinda like how when looking up a .co.uk domain first goes to .uk, then .co.uk.