Subdomain on A Real one??

OK, Forgive me if this is a dumb question...

But is it possible to add a subdomain onto your purchased domain name?..

Such as this forum and all others are... ?????.forumotion.com

can we make it so our purchased ones connect like this...

Subdomain.yourpurchasedforumotiondomain.com

if that is possible please tell me how.. and if not, im sorry for the question, im just kinda new at this.

When you make html pages in:
admin panel -> modules -> html

the pages you create are sub domained.
for example if i have a forum called abc.forumotion.com
the html pages will be *html page name*.forumotion.com

but other then that you cannot either purchase or get other subdomain domains

but you can always purchase a subdomain from a different service provider (for example FTP)
but you will not have the ????.forumotion.com

yeah i tried that, but it was more like http://www.Website.org/Page-h1.html

But thanks, i figured it out now.