How to Track Pours
Suppose I sell wine (or any alcohol) by the bottle and by the glass. With a bundle variant, I can make sure the inventory always comes out of the same place.
Let's take a bottle of Cabernet as an example:

- Create a Product. — Suppose this is a "2017 Premium Cabernet" and the bottle is 750 ml. I'll use those as my Product and variant names, respectively. Click "Add Single Variant" to enter the Variant Name.
- Add cost, quantity on hand, and list price. — Remember, cost is what I paid for the bottle, quantity how many bottles I have in stock, and price is what a customer will pay for a bottle. Save the Product.
- Now add a bundle variant. — We'll specify that this is a "Glass" in the bundle variant name.
- Select "2017 Premium Cabernet (750-ml Bottle)" as the component Product. Supposing you get about 4 glasses per bottle, your Qty will be 1/4, or 0.25.

The same principles apply to liquor and anything else you sell a portion of. For instance, if you create a bundle to represent a single shot, and you expect to pour about 17 shots per bottle, your component Qty will be 1/17 = 0.059.
Mixed Drinks
To create a bundle composed of multiple Items, simply add the Components one by one.

Remember, however, that if you choose to make this a bundle variant of the primary ingredient, that's where it will be organized in your register. You may prefer to make mixed drinks/recipes their own products, especially if you don't sell liquor by the bottle. To do that, simply create a new product and convert it into a bundle rather than making it a variant of an existing item.
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