Adding column of summary date values

Lindsay AR
Lindsay AR ✭✭✭✭✭
edited 12/09/19 in Formulas and Functions

I have a "Date Completed" column in my list that I would like to roll up like Start and Due Date do with sub-tasks in the hierarchy. I have been unable to figure it out with formulas. So, I am looking for the last date entered in "Date Completed" of a sub-task to auto fill that same date into the highest level of the task. 


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