Just write in your functions.php
// To add Orders as main menu after dasboard.
http://codex.wordpress.org/Function_Reference/add_dashboard_page
function dasboard_sub_menu() {
global $menu;
global $submenu;
$menu[6] = array( __('Orders'), 'read', 'edit.php?post_type=shop_order', '', 'menu-top menu-top-first menu-icon-orders', 'menu-dashboard', 'none' );
$menu[7] = array( __('Catalogue'), 'read', 'edit.php?post_type=product', '', 'menu-top menu-top-first menu-icon-catalogue', 'menu-dashboard', 'none' );
$menu[8] = array( __('Coupons'), 'read', 'edit.php?post_type=shop_coupon', '', 'menu-top menu-top-first menu-icon-coupon', 'menu-dashboard', 'none' );
//$menu[4] = array( '', 'read', 'separator1', '', 'wp-menu-separator' );
$menu[59] = array( '', 'read', 'separator2', '', 'wp-menu-separator1' );
$menu[99] = array( '', 'read', 'separator3', '', 'wp-menu-separator2' );
$menu[56] = array( '', 'read', 'separator4', '', 'wp-menu-separator3' );
$menu[57] = array( '', 'read', 'separator5', '', 'wp-menu-separator4' );
$submenu[ 'index.php' ][1] = array( __('Reports'), 'read', 'admin.php?page=woocommerce_reports' );
}
add_action( 'admin_menu', 'dasboard_sub_menu' );
// To add Submenu Orders under Dashboard Sub Menu
// To add Orders as main menu after dasboard