Thread:Project talk:Support desk/Multilevel navigation in sidebar

Hi, I am new to this wiki, how does mediawiki support multilevel navigation in sidebar. Like: Country->State->City->localitity. It is said that if we modify css and skin.php, we can achieve this, but nowhere it is specified how it is to be done. It would be very grateful if there are clear instructions provided how to do this.

Mediawiki:1.20.3 PHP: 5.20

Thanks and regards, Chary