sub_menu

how to add a menu below awada-header. it should be above “post-wrapper-top section-shadow clearfix”class.
i need to do this only for two/three pages .
as we click on the new menu item which we created now , it should display the content in the same page.
same thing to be applied for all new-menu items
should display content in the same page , and the menu we click, it should be active
default first menu will be active.

Thank you