How to modify the WordPress importer plugin to Import Menu Item's custom fields

WordPress - Import Menu Item's custom fields.php

<?php
# WordPress - Import Menu Item's custom fields
# By Fouad Badawy - TieLabs.com

#1- Edit wordpress-importer.php
#2 search for

		$id = wp_update_nav_menu_item( $menu_id, 0, $args );
		if ( $id && ! is_wp_error( $id ) )
			$this->processed_menu_items[intval($item['post_id'])] = (int) $id;
			
#3- Replace it with

		$id = wp_update_nav_menu_item( $menu_id, 0, $args );
		if ( $id && ! is_wp_error( $id ) ) {
			$this->processed_menu_items[intval($item['post_id'])] = (int) $id;
		
			/* By Fouad Badawy ( TieLabs.com ) - Store The mega menu custom options */
			$tie_menu_option = array( 'tie_megamenu_type', 'tie_megamenu_columns' );
			foreach ( $item['postmeta'] as $meta ){
				if( in_array( $meta[ 'key' ], $tie_menu_option ) && !empty( $meta[ 'value' ] ) ){
					update_post_meta( intval($id) , $meta[ 'key' ], $meta[ 'value' ]   );
				}
			}
		}

#4- Change the value of $tie_menu_option in line 19 with your custom fields name
?>