How to add submenus?

Can anyone help me on how to add submenus to the menus? From the admin panel I see no way to do it, so I think I'll have to do it programmatically in the themes folder.

But then I have not the slightest idea from where to start. Is there any tutorial or example I can follow?

Thanks.

Go to Apperance->Navigation and enter your data to the "Add a Link to the Navigation" section.
Than you can drag&drop the new menu item wherever you want. To have is as a submenu just drag it a bit right under the main menu position.

http://omeka.org/codex/Managing_Navigation_2.0

Thank you, miniol,

So simple!!!! I'm not a very good "touch and drag" generation :-)

I'm quite impressed by Omeka. Very good!

Best,

daniel