To begin with, it is important to set the cost of the products. For simple products, you can easily set the cost by going to the product edit page Product data> General> YITH Cost of Good.
For variable products, you will be able to add the main cost to all variations or individually cost per variation.
Besides the Reports (read more about them here), the cost of your products will be available in the Orders details, both for every single product and for the entire order, just below the Order totals.
