WordPress – Apperance > Menu

If you check the codex documentation page about the wp_nav_menu you will see that there is a param called menu, and that will allow you to target a specific menu.

As pointed on the documentation you can check this:

wp_nav_menu(
    // Use this menu
    'menu' => 'Project Nav',

    // do not fall back to first non-empty menu
    'theme_location' => '__no_such_location'

    // do not fall back to wp_page_menu()
    'fallback_cb' => false
);

But if you want to register a place I mean theme_location, you need to register_nav_menu then a new Widget will appear on the Appearance tab and you will be able to select which menu goes to that location registered.

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You just need to place this on your theme functions.php and head over to the “Appearance” > “Menu” on the WordPress Admin and select the menu you want to be assigned to the Primary Menu.

add_action( 'after_setup_theme', 'q166543_register_menu' );
function q166543_register_menu() {
    register_nav_menu( 'primary', 'Primary Menu' );
}

Then head over to the place you want to display the menu and paste the following code:

wp_nav_menu(
    'container'      => false,
    'theme_location' => 'primary',
    'exclude'        => '479',


    // do not fall back to wp_page_menu()
    'fallback_cb' => false
);