Can a branch sign a contract with the winning company?

After the branch company wins the bid, if the head office signs a contract, it is illegal and the contract is invalid. Companies can set up branches. The establishment of a branch company shall apply to the company registration authority for registration and obtain a business license. A branch company does not have legal person status, and its civil liability shall be borne by the company. A company may set up subsidiaries, which have legal personality and independently bear civil liabilities according to law. The winning bidder shall fulfill its obligations in accordance with the contract and complete the winning project. The winning bidder shall not transfer the winning project to others, nor shall it dismember the winning project and transfer it to others separately. The winning bidder may, according to the contract or with the consent of the tenderer, subcontract part of the non-major and non-critical work of the winning project to others for completion. The person who accepts subcontracting shall have corresponding qualifications and shall not subcontract again. The winning bidder shall be responsible to the tenderer for the subcontracted project, and the subcontractor shall be jointly and severally liable for the subcontracted project.