[TYPO3] How can i do to have multiple webs with Typo3?

[Mihai Vigariu]

Hello,

I have the TYPO3 installed in the root of my online directory. But currently 
i want to create a webpage like

www.mydomain.com/webpage

Do i have to move Typo3 in the folder webpage, so that i can create the 
Webpage? Or Typo3 can stay in the root of the www.mydomain.com, and from 
there create the subpage Webpage?

Thank you in advance,
Michael.