Does this overwrite existing subitem assignments?

Yes. The action sets each subitem's people column to match the parent's value, replacing any existing assignments. This ensures all subitems are aligned with the parent's current assignment.

Can I copy to a different people column on the subitems?

You configure which people column on the parent to read from and which people column on the subitems to write to. They can be different columns as long as both are people-type columns.

What happens when a new subitem is added after the action ran?

New subitems won't automatically get the parent's assignment. Pair this action with a 'when subitem is created' trigger to ensure new subitems also receive the parent's assignment.

Action

Copy People Column to All Subitems

“Copy the parent's people column to all subitems”

Assign the same person or team from the parent item to every subitem. When the parent's assignment changes, all subitems update to match.

Use Cases

Assign all subitems to the project owner when they're assigned at the parent level

Push the team lead assignment from a milestone to all task subitems

Re-assign all subitems when a project changes ownership

Real-World Example

Your client board has parent items for accounts with subitems for deliverables. When the 'Account Manager' people column changes on the parent (due to team restructuring), this action updates every subitem — ensuring the new account manager sees all the deliverables in their My Work view immediately.

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