Code-Snippets-Functions/Execute a function on a child site/WooCommerce/add-a-text-to-woocommerce-orders-displayed-total-price.txt

add_filter( 'woocommerce_get_order_item_totals', 'custom_order_total_line_html', 1000, 3 );
function custom_order_total_line_html( $total_rows, $order, $tax_display ){
    $total_rows['order_total']['value'] = __('excl. BTW ') . ' ' . $total_rows['order_total']['value'];

    return $total_rows;
}