With Product Builder, the customer can create a product with one or more SKUs.
If you were selling Tablets:
- Select an iPad type - SKU
- Select a case - this may or may not be a SKU, it could just be a choice that doesn't affect the price but gets passed through as an attached attribute.
When the final product is ordered, it can represent many SKUs used to build their product or just one SKU and all options are not SKUs, either work.