Dear BabaStudio.
Requirement:
I know what your are looking for. in your letter you tell us that you have a website and you want to use this website as a 10 different websites. In this letter you told me that i have to just only change the CSS to make your one website in to 10 different website.
Solution of Requirement:
We just have to change the design, Colour and style of the given website in to 10 different website. We just have to set the header, Footer, Sidebar, background in CSS, through this we can make the different style of a same site. I hope you will understand me that what i am saying.
Farhan Shahid