What does it mean to go to work in Unicom and sign a contract with Unicom Huasheng?

I went to work in Unicom and signed a contract with Unicom Huasheng, because Unicom Huasheng Communication Co., Ltd. is a wholly-owned subsidiary of China United Network Communication Co., Ltd. (Unicom for short).

Because the branch company has not obtained the corresponding qualification or business license, employees need to sign labor contracts with the head office, and the branch company is responsible for the head office.