Programmed all your shutters individually, connect only the first shutter to the mains power supply, then set the up and down limit, (this is shown on the How to Program link below). Then disconnect this shutter from the main power supply. Repeat this process until all the shutters that will operate on that channel are programmed. These shutters can then be reconnected to the main power supply, this group of shutters will now operate simultaneously when this channel is selected.
Setting the next channel, press the round button below the four lights to toggle through to the next channel. Repeat the above process until all shutters are programmed to the desired channel. On the fifth press of the button all four channels will be activated, allowing you to master control all programmed shutters at the one time.