Hello! My coworker and I think we are close to figuring out this formula on our Metrics Sheet but we keep receiving the "Incorrect Argument Set" message. Here's the formula in the screenshot:
=INDEX(COLLECT({Per Complete}, {P2H Task}, $Reference@row , {Milestone}, 1))
{Per Complete} = the %Complete column in the source sheet. This column is using hierarchy and formulas to average the % complete of each child row to display a % complete of each parent row.
{P2H Task} = the specific task name from the source sheet that matches the $Reference@row
{Milestone} = a checkbox row on the source sheet that is true/checked because it's a parent row.
Thank you in advance for any insights you can provide!