intrastat-extrastat/product_harmonized_system/readme/USAGE.md

As this module only depends on the product module and that module doesn't provide any menu entry, this module lacks a menu entry for H.S. Codes. A menu entry for H.S. codes is provided by the module product_harmonized_system_stock.

Once the H.S. codes are created, you will be able to set the H.S. code on a product (under the Information tab) or on a product category. On the product form, you will also be able to set the Country of Origin of a product (for example, if the product is made in China, select China as Country of Origin).