these subdomains are individual folder on server..my site folder is seperate domain and all my project is reside on this folder now how my subdoamin folder will be link to main domain folder with out copying all the project on subdomain folder.
In IIS console, open the properties for the web site that you want to handle the names. In the "Web Site Identification" section there is an "Advanced" button, that will open a window where you can add identities for the site. The "Host Header Name" is where you put the subdomain names.
My stuff is like this :