Datafeed Customisation

Have a product data feed currently installed on an e-commerce site. The e-commerce site is built in Joomla and Virtuemart. The feed is setup correctly, wholesale prices are in the feed then adjusted globally through Virtuemart, so all prices are marked up the same. Need to adjust product prices via category and also individually. Also need to add content to product pages using templated content with <insert product name> at various points. Data Feed will be updated weekly with new/removed products, everything should remain in the feed, however adjusted prices and added content need to be added. Only If you have experience in doing this and can prove it and show examples of your work and can complete the job easily I look forward to your bid.