Automation to updates all with same name in the primary column?

Kimbh ✭✭✭✭

Hi, I primary columns with customer ID's. I have date columns I put today's day in when I have contacted that client.

What I need is, when I put a date in the date in the column, is to have all the customer with the same ID in the primary column to have the date column also fill. Or a help column auto fill with a text or a symbol auto fill.

I don't want to have to search up all the same customer ID and put in a date or something to let me know they have been contacted.

Any advice on how to do this.

Thank you