Flag Descendants
I am looking for help with a formula that will "flag" the row if it is past the end date and not 100% complete (I have this part figured out), but I am also looking to flag the row if any of the descendants of the row are flagged. IE if the child is flagged, all parent rows should be flagged.
Answers

Say your flag column is called "Flagged":
=IF(COUNTIF(DESCENDANTS(Flagged@row), =1) > 0, 1, 0)
English: Count flagged rows that are descendants of this row's "Flagged" cell, if the count is greater than 0, flag this cell, otherwise, don't flag the cell.
Regards,
Jeff Reisman, IT Business Analyst & Project Coordinator, Mitsubishi Electric Trane US
Link: Smartsheet Functions Help Pages Link: Smartsheet Formula Error Messages
If my answer helped solve your issue, please mark it as accepted so that other users can find it later. Thanks!

Thanks Jeff but I am stuck on putting both formulas together. Currently what I have is below but it is not working as I intended.
=IF(AND([% Complete]@row <> 1, [Target End Date]@row < TODAY()), IF(Hierarchy@row = 0, IF(COUNTIFS(CHILDREN([Task Late]@row), @cell = 1) > 0, 1)))
Do you see what I am doing wrong here?

=IF(AND([% Complete]@row <> 1, [Target End Date]@row < TODAY()), IF(COUNTIF(DESCENDANTS([Task Late]@row), =1) > 0, 1, 0))
Sorry this is the formula I currently have ^^^

I think you're just missing an end parentheses to close off the AND statement. Right there:
And you may have an extra one at the very end. 👍️
Regards,
Jeff Reisman, IT Business Analyst & Project Coordinator, Mitsubishi Electric Trane US
Link: Smartsheet Functions Help Pages Link: Smartsheet Formula Error Messages
If my answer helped solve your issue, please mark it as accepted so that other users can find it later. Thanks!

Jeff  I just figured out the correct formula. It was very similar to what you posted. I was still getting a syntax error with the formula you posted.
Here is the final version I am using:
=IF(AND([% Complete]@row <> 1, [Target End Date]@row < TODAY(), NOT(ISBLANK([Target Start Date]@row)), NOT(ISBLANK([Target End Date]@row))), 1, IF(COUNTIF(DESCENDANTS(Late@row), =1) > 0, 1, 0))
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