Showing sidebar-2 on custom template page

you can put this code in your functions

add_action( 'init', 'register_my_menus' );
function register_my_menus() {
    register_nav_menus(
        array(
            'menu-1' => __( 'Head' )
        )
    );
}

and this code, in the place you want your second menu

<?php wp_nav_menu( array( 'theme_location' => 'menu-1' ) ); ?>

and than, you can control your new menu, through the menu section in the admin panel