Defining a new banned application

When using this feature, do you HAVE TO have a parent application?
Or can it just be the .exe(cutable) file by itself?

Can someone explain what the difference between, just specifying the application and the parent application is?
I mean, say I want to block program A from accessing the internet, but it seems as though program A is the parent.

Do I have to put program A.exe in the specify section, then also in the parent section?
Or can I just leave it in the top part, “specify section” and that’s good enough?