Viewing and Ordering Mulitple Sizes – ecommerce

Hello! I am attempting to create a site on WP to emulate a current webstore hosted on another platform. I’ve got basically everything I need except for one thing. We make and sell t-shirts, and our typical order consists of multiple sizes of the same item. On our current platform, the product page allows the customer to enter the number of each size shirt that they need from one page (sizes S-5XL). Once the quantities have been entered, the “Add to Cart” button adds all sizes (in the quantities ordered) of that item to the cart. It kind of looks like a grid, with three columns (QTY BOX, SIZE, PRICE) next to each other. S-XL are one price, each size 2XL – 5XL are different prices. The general idea is that we don’t want to make the customer select one size and then add them to the cart, then select the next size and add those items to the cart, etc….

I have installed and uninstalled many of the e-commerce plug-ins and have searched every possible combination of terms I can think of on the World Wide Web, and have found nothing. Does anyone know if any of the current shopping cart or ecommerce plug-ins solve for this?

Thanks in advance for your help!