In an online store, this will allow the customer to select or change a product in the KIT. For example, you have a set of 1 WINE and 1 CHOCOLATE BAR, you can let the customer decide which chocolate he wants.

So, the Composite product page will allow the store owner to add various attributes in the composite page and then create the composite for each attribute.

SKU 1 = WINE + CHOCOLATE 1
SKU 2 = WINE + CHOCOLATE 2