Creating a domain name with /extension

Hi,

I want to create a domain name with a /en extension similar to http://www.ryanair.com/en for England and /ie for Ireland http://www.ryanair.com/ie under the main site .com.

I have watched your tutorials http://www.youtube.com/watch?v=xqzEo3EP5oQ&feature=autoplay&list=PLA822A575AC9E38AB&playnext=1

Is it possible to create a sub domain with domain mapping using an /word ?

Please advise,

Eileen