Well, the sales company you mentioned is nothing more than strengthening the separate management and financial assessment of sales, which can be done by the marketing department.
Department:
If your company produces similar products (such as electronic products or computers), you don't need multiple business departments. If your company is engaged in computers, real estate and investment companies specializing in overseas investment, your company can be divided into three business divisions.
Subsidiary:
If your company has overseas expansion (only overseas establishment), you can set up multiple subsidiaries as a group enterprise.
Branch:
If your company only sells export and domestic products for the time being, you can set up branches according to the needs of the region.
The marketing department can be divided into two parts, the export department and the domestic sales department. Because there is no obvious conflict of interest, the management division of the marketing department can be blurred. The sales center and call center managed by the marketing department can also be divided into two parts according to export and domestic sales.
Both export marketing department and domestic marketing department should be independent profit centers, that is, when products are transferred between them, they should be accounted for independently. As for the transfer price, it can be based on the market price or lower than the market price, but it must not be lower than the cost plus price, otherwise there will be great conflicts of interest.
The information you provide is limited, and you can only say so much. If there is a depth problem, provide depth information!