Best approach to setup 30 urls reading off one SQL database

I have been asked to manage a project comprising around 30 URLs all reading data from a single MySQL database. I have a dedicated server based in the UK, managed by a ISP called Fasthost. The server is Linux running Ubuntu. I currently run all my sites by setting the DNS to my nameservers, then setting up the server space through a control panel on the server, and then uploading files through FTP. Is there a way of setting up the Domain Name Server to point these urls straight to a standard set of files, with data and site css/theme configured through a table by the site_id ?? I do have an existing short cut for batches of linked sites where I have set up a parent/child type of structure with one URL and fies acring as the parent but it involves full server space setup, uploading a standard set of files to each child server space, The index page of the child site uses multiple php includes which - and if there are any development changes all the sites have to be updated. Can anyone suggest a route forward. I would like some advice on best practice approach for this project and a cost to implement it. Thanks all