Question : Add second primary DNS zone

There is only one server in the company. It is the DC running AD and DNS, the OS is Windows SBS 2003. Currently there are only 2 forward lookup zones:
_msdcs.keysales.local
keysales.local

We have a web testing/development environment computer and wanted to add a DNS record so that you could type dev.keysales.com and it would use the local dns to resolve the local IP address of the dev server. I did this successfully, on the first try with no issues at all. Under "keysales.local" it added a folder called "com", under that folder it added a folder called "keysales", and in "keysales" folder it added a Host (A) record named "dev" and with the IP address of the dev server. Again that works perfectly.

The current issue is that now we need do the same exact thing, except for a different domain. i.e. add a zone for "mousesales.local" so that when you enter "dev.mousesales.com" it again redirects it locally to the dev server. However even after adding a primary zone for "mousesales.local" and the "com" folder within that, and "mousesales" under that, and "dev" Host (A) record, with the IP address, it still doesn't showup when using NSLOOKUP. Could someone outline the step by step process for adding a second Primary zone if that is the correct thing to do, and if not point me in the right direction.

Answer : Add second primary DNS zone

You're currently not resolving "dev.keysales.com", you're actually resolving "dev.keysales.com.keysales.local".
I'd recommend you remove the "com" subdomain in keysales.local.
Then create a new forward lookup zone "keysales.com" (right-click "Forward Lookup Zones" in the DNS MMC, follow the wizard; you can use "AD integrated" as type); add a host (A) record "dev" there. Note that this will force you to enter all hosts under "keysales.com" to this zone if there are other (external) hosts you want to access, like www.keysales.com, because your DNS server will now be authoritative for "keysales.com".
If you don't want that, and you only need to resolve "dev" internally, there's another possibility:
Create a new forward lookup zone "dev.keysales.com"; in this zone, create a new host (A) record, leave the name field *empty*, just enter the IP address of your internal host.

The same procedure applies to "mousesales.com".