Hello Martin,
Thank you for your post.
Yes, we provide an import customization service for additional fee, please find the pricing here:
http://store.emagicone.com/prestashop/prestashop-services/product-import-to-prestashop.html
Please submit a ticket at:
http://support.emagicone.com/submit_ticket and provide us with your XML file, so we could check it first
We do not provide a custom programming. Please find a list of our services here:
http://store.emagicone.com/prestashop/prestashop-services.html