A representative office in China merely represents the businesses that exist back home. Therefore, they are not separate from the main branch (which exists outside of China) but merely a ( rep offices) Representative of a China foreign-owned company. 

Moreover, they cannot participate in any activities that cause them to gain returns for the foreign investor. According to Chinese law (China administration of industry and commerce), they can only perform liaison activities.

They are not permitted to sign up legally binding documents or charge any customers and cannot charge a sales service fee. Basically, they cannot conduct direct financial activities, like making money in China or receiving money from Chinese people and businesses.

However, bank branches, insurance firms, accounting, and law companies are allowed to participate in activities that would cause them to gain wealth in China. Representative offices in China are suitable for marketing research, connecting with clients, or global networking.