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Q: Platform Event with Process Builder to Update Contacts Related to an Account In a scenario where an account has a number of contacts. When a field on the account changes, need to propagate that value to all related contacts. I know it can be done with a visual flow and Apex trigger but not Process Builder. Could I use platform event to watch for that value change on the account and publish account Id and new value so related contacts can see it and update themselves by using a Process Builder?
In other words, can I utilize platform events to update children from a parent?

A: You definitely can update child records when the parent changed via Process Builder. 
When you create an action in PB make sure to select the "Select a record related to the Account" option in the Record Type section.

Then select Contacts and define new field values for the records you update.

Now you are all set.

user
In that passage, there are 48 occurrences of the letter "c."
assistant