For example, if you want to reduce write-off costs, but the shelf-life of a product isn't recorded in the accounting program, an inventory must be done first, and the shelf-life data for each batch of product should be recorded.
For a thorough analysis, you need to consider both revenue and cost data for each product, such as transportation costs, rent, manufacturer bonuses, etc.
If there's no data breakdown available, you can use total costs, but this might distort the picture to some extent. For instance, the costs of refrigerated storage apply only to the products stored there. If these costs are spread across all products, it will distort the profitability of each item.