A bundle (or kit) is built from other products. For example a Gift Box might contain 1 perfume, 2 soaps and 1 ribbon.
Mark a product as a bundle and add its components with the quantity of each. The dashboard shows how many bundles you can build from current stock.
When you sell a bundle, each component's stock is deducted automatically. If any component is short, the sale is blocked. Bundle profit uses the bundle's selling price minus the combined cost of its components.