Worried about overwriting existing products when uploading customer choices

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Hi

The section of my website I am currently doing has 85 products (Desktop computers) that are in a Product fileset on a webpage and linked to their specific product specification page. I did this work before I purchased the Import add on option.

I need to add to each product 11 customer choices (Warranty upgrades). After setting up my warranty upgrades for 2 sample products in an XML test file and doing some testing I notice my test pages delete the product on the web page and I have to re add the product.

I want to be able to add the warranty customer choices but not override any existing product information. What is the best way to do this?

Regards

Steve

P.s I am still a newbie to this so am still learning