Woocommerce API Hook or Plugin for multiple check box checkout

*****Any bid higher than the budget will be automatically Rejected******* You should have previous experience with Woocommerce and its API. We need a simple hook or plugin for our wordpress & woocommerce site that allows using CheckComboBox for selection of products in the checkout. We need something like [login to view URL] Basically the clients will have the option to choose multiple checkbox in the dropdown menu and that would be selected as their choice for checkout. We need the admin to be able to define the product and the dropdown menus and the pricing changes accordingly.