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How do I control 3 digital outputs, with a single switch?

Are you using a Pi or Arduino?

Arduino, I Got it workinh by wireing pin 3 to all 3 relay…
But I’am not sure that The Way to go

Yeah, I probably wouldn’t. Depends what relay you have, might be pushing the limits of the pin. I’m not sure if this would work or not, but you can give it a try…set up a trigger for the other pins. Ex. Trigger 1: if pin 1 is low, set pin 2 low. Trigger 2: If pin 1 is high, set pin 2 high Trigger 3: if pin 2 is low, set pin 3 low. Trigger 4: If pin 2 is high, set pin 3 high. There were some issues with Arduino triggers that I’m not 100% sure are fixed yet but give it a try to see if it works.