What we need is a customization of Magento ([url removed, login to view]). We need a custom module that lists items (organized by a certain attribute) and has a box that allows the user to select the quantity for each item. We also require it to have a button to add all selected items to the cart.
Bundle items are very similar to what we need, however they are short just a few necessities such as adding multiple items with configurable quantities.
This should not be very difficult if you are familiar with Magento and understand it.
Once again do not bid on this unless you are Srmithi.