Thank you for the explanation.
All you need to do is to edit your menu in Appearance -> Menus and drag some menu items under one of your first-level links. If you want to create mega menu dropdown then we suggest you to read this instruction http://xtemos.com/forums/topic/left-side-menu-order-quantity/#post-3736
If even after these actions you will not get menu dropdowns then please provide an access to your website so we could see what is wrong.
Regards