I don't know what do you want to achieve. You can track stock quantity by checking the "Stock quantity" field in Inventory tab, or Stock quantity assigned to Warehouses, if you have multi warehouse store.
Thank Yao. I assigned and want to report to check inventory by warehouse/store. I try run product list with filter by store. But the quantity is shown by all.
In the system, there is no existing report to check inventory by warehouse/store. There is only one global report Low Stock. The product list does not limit stock by the warehouse. It's by design.