I tried to count all parents inside a sheet but since now it was only possible with an additional column.
The formula I used to check if it was a parent is this one: =IF(COUNT(PARENT([Task Name]2)) > 0, "false", "true")
And to calculate how many parents are existing, I just counted the cells, where the value is "true"
My question is: Is it possible to count all Parents without using an additional column?