Bundles

A bundle is a set of things you already sell. You pick the products, the size where a product has sizes, and how many of each. You do not type a price for the set: you say what the saving is — a percentage, or an amount off — and the price is worked out from the parts. Change what a part costs and the set reprices itself.

• Each part's own product page carries the offer — Buy together and save — with one button that puts the whole set in the bag.
• It appears in the cart too, when a shopper already has some of the set: one line offering them the rest of it at the saving.
• The order shows each part on its own line, named with the set, at the price after the saving is shared across them. So an invoice still lists what actually left your shop.
• Stock comes off each part, not off the set. A set has no count of its own.