There will be many companies in the group, and generally different companies will be countersigned for tax issues. For example, the xx Division of the Group now has a different place of registration and office, and it needs to sign a subsidiary of xx for tax purposes. However, some employees also sign the parent company when government subsidies are involved. Under normal circumstances, the income should be the same. If they change the contract subject many times during their tenure, they should pay attention to changing the agreement.
A branch company is not a legal person and cannot sign labor contracts with workers. Only the head office can sign labor contracts with workers. Of course, it is a subsidiary under the name of the head office, so it is an independent legal person and can sign labor contracts with workers. The difference between a head office and a subsidiary is that the salary of the head office is higher than that of the subsidiary.