Code for showing total column in packingslip - By WebToffee ( WooCommerce PDF Invoice, Packing Slips, Delivery Notes and Shipping labels )

functions.php

<?php //do not copy this line of code
add_filter( 'wf_pklist_alter_product_table_head', 'add_total_wieght_column_head', 10, 3);
function add_total_wieght_column_head( $columns_list_arr, $template_type, $order ) {
	
	if ( 'packinglist' === $template_type ) {
		if ( isset( $columns_list_arr['-total_weight'] ) ) {
			$columns_list_arr['total_weight'] = $columns_list_arr['-total_weight'];
			unset( $columns_list_arr['-total_weight'] );
		}
	}
	
	return $columns_list_arr;
}