Property employees hit people during working hours, causing minor injuries. Should the defendant and the property management company sue separately or together?

Just sue the property company and the infringer together.

Legal basis: the Supreme People's Court's interpretation of several issues concerning the application of law in the trial of personal injury compensation cases.

Article 9 Where a laborer causes damage to others in employment activities, the employing unit shall be liable for compensation; Workers who cause damage to others due to intentional or gross negligence shall be jointly and severally liable for compensation with the employer. If the employer is jointly and severally liable for compensation, it may claim compensation from the laborer.

Engaged in employment activities mentioned in the preceding paragraph refers to engaging in production and business activities or other labor activities within the scope authorized or instructed by the employer. The employee's behavior is beyond the scope of authorization, but its manifestation is or is intrinsically related to the performance of duties, which should be considered as "engaging in employment activities".