Hi,
I'm trying to design a new drupal site. But i'm new to drupal and have some questions.

My idea is to create two level menu system.
Main menu items should be on the top (as primary links), and submenu items on the left sitebar as secondary links.
Each main menu item has its own submenu items so that pressing on the main menu item changes the submenu items on the left.

I was thinking that each menu item from the primary links can be expanded and its children appear in the secondary links. And i set up a new menu on the left sitebar to hold the secondary links.
but it didn't happened as i expected - i couldn't see this new menu on the left at all even when i click on a primary link.

Any suggestions?

Thank you in advance!