Checkout, cart, and inventory

In the cart. Each product of the bundle is its own line. The bundle saving is shared across those lines in proportion to their prices, so the invoice shows each product at its discounted price.

Two bundles. Adding the bundle twice doubles every product's quantity and the saving.

Coupons. Store coupons and automatic promotions can still apply on top, depending on how they are set up in Marketing → Promotions.

Stock. Each product's stock goes down as with a normal order. If one product has no stock, the bundle can't be added.

GST. Tax is worked out per product on its discounted price, so each item keeps its own GST rate (for example 5% on food, 18% on cosmetics).

Returns. Customers return individual products; the refund is the discounted price shown for that line on the order.