Stock card is a report located in the inventory module.
Inventory > stock card
You can select items by using their key numbers or by entering the product. You can also filter this list until which date you want to see the stock card for.
This report will list you all the changes regarding the selected product in all warehouses you have. You will be able to see the purchase orders, sales orders, work orders, stock adjustments, transfers linked to the selected product.
In this report, you will also see how the stock price built up over the time, selling price, selling amount and margin amount.
You can also open the stock card report directly from the product.