Subdomains on a page

Hi there

I want the page I set up with the permalink http://www.touristhq.com/africa to be http://africa.touristhq.com

However when i created the subdomain http://africa.touristhq.com in my hostgator cpanel it created a directory africa which the link is http://www.touristhq.com/africa

it’s showing the directory not the page with the permalink

I have installed the advanced subdomain plug in and i have read somewhere that I would have to create an index.php in the africa directory with the same code as http://www.touristhq.com/africa but there must be an easier way of doing it than that