WordPress 3.0 Multiple domains can be added but not able to see in Sites

Hi,

I have installed WordPress on my server on one of the domains.
I have to configure this for 4 domains. I have created multiple tables in single database. Now the issue is that multiple domains can be added but not able to see in Sites in superadmin.

PLZ help. I want to manage all the domains from one login. Do i need to install wordpress for all the four domains separately….

??