An external stylesheet is applied to whole html page.
In order to apply different stylesheets to different portions,
Firstly, the html page has to be divided into different sections using the html tag ( with each html div to be assigned a unique id or class)
Secondly, the external stylesheet to be applied to each div has to be designed according to the id/class assigned to it
Example as explained above by Gaby aka G. Petrioli...
