How to Enable "Includes Main Task and Subtask Values" for Custom Fields?

Hi everyone,

I’ve noticed a small upwards pointing double arrow icon on some custom fields in my Asana tasks. When I hover over it, it says “includes main task and subtask values.” I’d like to replicate this functionality in other custom fields, but I’m not sure how to enable it, even within the same custom field type.

Could anyone guide me on how to do this?

Thanks in advance!

I believe this is automatic when there are values in the subtasks and the main task is closed (in List view). It doesn’t work on another number field you have?