Audi A6 C7 (4G) Climatronic zones sync modes

How to sync 2 instead of 4 zones with Climatronic control unit in A6/S6/RS6 C7. Pressing the button on the dashboard will synchronize all climate zones to the drivers temperature. It will stay that way until one of the passengers changes its setting. But if you want to sync only 2 front climate zones, you can press and hold on the drivers temperature knob for few seconds. After that front passengers temperature will sync with drivers, while second row will have its own independent setting.