Auto configurable product / Database automation

I have a database with about 3000 products, i need to make a way to auto create a new virtual product for each product that is avalible in multiple size. So if I for example have 3 products called 100XL, 100M, 100L, if shall make a new product called 100 and then add the 3 products to a field in this product. It also need to use some of the fields from the other products, description etc. I have the database in a csv file and would need it delivered as this, so I can import it into the store. Is this possible, so I dont need to do it all by hand? It is for a magento store, so if you rather want to try and fix and automation tool in magento, I would also accept bids for this.