Need a Formula that only applies to Parent rows

I am trying to figure out a formula that will only apply to parent rows. I want the Parent % complete to calculate on the total percentage of all child rows. The embedded formula depends on a duration, and I do not want that.

The current formula I have is this:

=IF((COUNT(CHILDREN(Primary@row)) > 0),AVG((CHILDREN([% Complete]@row))),([% Complete]@row))

I'm not sure what the second part of my if statement should be, since I want it to be whatever % has been entered for the Child row.

I was hoping to also make this a column formula to apply to all rows, but not sure if that is possible.


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