A master switch can control several linked groups. Multiple station control is also available, with momentary contact switches. Group control is a low voltage control system, and does not allow for independent operation of individual shades in the group. Insolroll's relay group controls can be linked together to control any number of motors. Insolroll can custom design a group control system that will give complete control of 110 VAC motors.
Relays are necessary to isolate individual motors when tying into master controls.