The client-side targeting on WSUS, when enabled, allows you to directly assign to a group declare in the console. This declaration is not done GPO or by modifying the register of the customer workstation.
Once activated, it is no longer possible to change the assignment of a station by hand from the WSUS console.
- Have created computer groups in the WSUS console.
- Configure clients with Group Policy.
Edit the Group Policy that allows client configuration and go to the Windows Update client settings in Computer Configuration / Administrative Templates / Windows Component / Windows Update. Open the Allow client-side targeting 1 setting.