Thrid party invoice import to QBO

Hi,

We have a third party CRM that creates an invoice and pushes it across to QBO via field mapping for sending.  How can we make sure that the delivery which has VAT on comes at the bottom of the product/service list.  Please note that the products that we send do not have VAT on, only the delivery.  At the moment it sometimes puts it at the bottom but will also put it in the middle and at the top on many occasions.

Kind regards,

Maria