How to distinguish parent-subsidiary relationship from business license or taxpayer name?

This situation should not be a mother-child relationship. Both sides are trading companies. In other words, the goods you bought from the Guangzhou company may be bought directly from the one in Shanghai and resold to you to earn the difference in the middle! If you can't see the mother-child relationship from the business license alone, you can ask the head office to issue a certificate to prove the mother-child relationship, and both parties can affix their official seals. If it is not a mother-child relationship, it will not be stamped with the official seal.