Creating a new Zone in DNS

Hi, we only have one forward lookup zone for our Active Directory domain, it's all Windows 2003 Native. Now we have many web servers on our DMZ (on our Cisco firewall) that external customers get to. They use addresses like ftp.domain.co.uk and webmail.domain.co.uk etc but my internal users can't get to these as the domain names resolve to external IP's on the firewall.

My internal users however can get to these my using the private IP address of these server, so I thought is it possible to create a new zone called doamin.co.uk and then create ftp.domain.co.uk etc to point to the private IP address, so everyone is use the same FQDN?

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