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<?php
// put these lines to your theme's functions.php

add_theme_support('menus');   // By using this menu option will be appear in the theme's appearance menus

// Now we are going to register menu name with wordpress

function register_theme_menus() {
  register_nav_menus(
		array(
			'primary-menu' 	=> __( 'Primary Menu', 'gp-header' )			// Menu Name and Location
		)
	);
}
add_action( 'init', 'register_theme_menus' ); // action hook for register menus with wordpress
?>