There are currently several ways to do that, and many of them are documented at http://www.mediawiki.org/wiki/Wiki_family.
The talk page there is a better place to seek the general kind of help you are looking for. If after you've tried a few of those methods and are still stuck, you could try asking a pointed question here.
maiki
On 08/30/2013 10:44 AM, Kolega 2357 wrote:
How in one folder MediaWiki make more than one MediaWiki sites?