How to define several levels of subsidiaries

A subsidiary established by the parent company according to law. A first-class subsidiary refers to a corporate enterprise of the host country established by the parent company to invest all or part of its shares in the world according to law, and a second-class company refers to a second-class subsidiary under the head office or a branch established in other cities. A subsidiary refers to a subsidiary established by the parent company in accordance with the law with all or part of its capital invested in other places.