Modify Website

I need changes made to [login to view URL] 1) Create the ability to Bulk upload to a category. For example, to select several photos to upload into the one category instead of only uploading one at a time. 2) Create the ability to make sub-categories. For example, a category called "Sports" could have another inside it called "Soccer" and another called "Basketball" 3) Create the ability to password protect some categories. 4) Add a popup when the "add to Cart" button is pressed which asks for image size (sizes available from a dropdown menu).