count only not the parent task

[RyoyaFukuda]

Hi all.
I would like to count and tally only the project tasks that are not the parent task and and display it as a report.
I would appreciate help on how this can be implemented.

[Mark Manders]

Probably missing something in your requirement, because this sounds like a simple 'parent = empty' condition?

[RyoyaFukuda]

In a case like parent - child - grandchild, I think that only "parent = empty" would count the child as well.

For example, in the following structure, I want to count only "D,F,I,K".

A-B-C-D

  └E-F
  └G-H-I
            └J-K