Data Entry For Magento

Hi **READY TO START NOW** We're inputting some new software in to a clients website, however it requires a Pricing update across all 120 CONFIGRUABLE products (roughly). The website is a Wholesaler website where users are on one of 4 price bands, Default Price, 5%, 10% and 25%. So if someone for e.g is viewing the website and they are on the 10% Price band, they will see a product which is £1.00 as £1.10. Each product has variations also, for e.g The default price for the product could be £0.50p but then the product (which is Ribbon) has different widths and roll lengths which effects the cost. So, a 50p product, could have various roll widths and lengths, for e.g 10mm and roll length 100meters, so the 10mm would add for eg 45p and the 100 meter roll length could add £1.00, so the total woud be £1.95. So, we need someone to go through each Configurable Product, and update the price of each product by the needed % (the default price will be already in there), which for some products includes the Roll Length and Roll Width.