Trying to sum the children of ColumnB but only for those rows where there is a DISTINCT value in the children of ColumnA. It seems like it would be simple but I'm blanking. Any help appreciated!
I'm thinking something like
=SUMIF(CHILDREN([ColumnA]@row), DISTINCT(), CHILDREN[ColumnB]))
but that obviously doesn't work because the distinct needs a refrence. I just don't know how to formulate it correctly...