How to manage sub-domain

Hi All,

I have 4 types of roles in my site i.e. Superadmin, admin, teacher & student.

When superadmin create a admin user then subdomain will create autometically for my site.

for example:

My site url is http://eschool.org

if i created an user "test" which have admin role then a subdomain (http://test.eschool.org ) will create autometically.

Please help me regard this problem.

Thanks in advance.