Feature request from seansan, posted on GitHub Aug 22, 2014
Request for the ability. That when you have a grouped or bundle of products based on configurable products and when the simple product attribute identifier is the same: that you only have to choose it once
So. When you buy a bundle of tshirts. (Where tshirt is configurable product. And per size is simple) that you only have to select the size drop down once - and this counts for all the configurable products in the bundle or group
http://magento.stackexchange.com/questions/5002/multiple-configurable-products-as-a-bundle