location map is useful for less materials, which is called fixed management. Nowadays, warehouses are generally managed by computers. Code the warehouse: first-unit, second-warehouse number, third-shelf number, fourth-material classification, fifth-seventh-material number. The simplest way is to use a spreadsheet. Create a simple table such as number, code, material name, warehousing quantity, warehousing date, warehousing quantity, warehousing date, balance quantity, unit price and description. In this way, you can query the spreadsheet to find the balance of the goods, and find the goods by coding. Of course, it would be better to write a simple database management program.