When creating an Item under Inventory, I was confused how to resolve this complexity:

I sell protein balls individually and in packs of three. There are two flavors. For analytic purposes, I want to track sales by package size and flavor. I have three options:

1. Create a separate item for each combination of attributes (four total).
2. Use modifiers for flavor or count.
3. Use per unit pricing.

Option 1 is undesirable, because adding a third or fourth variable would result in maintaining a large number of item skus, and require manual work to calculate sales across all variations of a single variable.

Option 2 doesn't seem to work with item cost. There's no way to have a separate cost based on the modifier, but otherwise it seems to be the cleanest approach.

Option 3 might work, but it's unclear if item cost is per item, or per price of [number of units]. There's no explanation or help page that describes how you are supposed to use per-unit pricing, or what an example of such an item would be.

I also see an option for variable pricing, but I have no idea what it is supposed to be used for. Variable barcodes?