Convert Excel file from *simple* products to *configurable* for seamless upload

Take existing Excel file containing all information, including images and change all *simple products* in various sizes and colors and change those to *configurable products* for seamless upload into Magento admin by freelancer. Winning freelancer WILL BE required to submit the EXCEL file uploaded to me (after upload and verification) which will include all information and images This is not a job for posers. Your work WILL be tested for upload. I will expect to see a screenshot of any work before it will be accepted and anyone willing to bid will be expected to submit ONE item which has been changed from *simple* into *configurable*. No worries as I know what I am doing and I expect over 50% of those bidding won't have the skill set they say they have (I have been doing this a long time). My current website is active, but this project is for a new design under construction on a developmental server. All admin access is also on the developmental server. Those who seem qualified will be given limited access to admin area to look at drop down menu and attributes Various attributes to consider are: 1. Size 2. Color 3. Manufacturer There are more attributes, but these are the main ones. Anyone with any knowledge of Magento will know how to download a sample of ALL the attributes. Thank you