Note for Vijay's solution you would need to keep the good and transport as separate files, Qlik will avoid the fan trap (multiplying the transport number by the number of goods lines).
Another solution is to categorize the amounts during the load and append transport costs into a single table
Invoice_number, revenue as amount, prooduct_id, 'goods' as amount_type
invoice_number, tranport_costs as amount, '' as product_id, 'tranport' as amount_type
another approach would be to create a 'product_id' for transport costs