Variable items are a product type in WooCommerce that lets you offer a set of variations on a product, with control over prices, stock, image and more for each variation. They can be used for a product like a shirt, where you can offer a large, medium and small and in different colours.
How to Set Up a Variable item
Putting a Variable item on sale
For more information please visit: https://docs.woocommerce.com/document/variable-product/