Hello nameless user,
First of all, if you "expect best idea" - which is a bit presumptuous but let's write this off under "language barrier" - then at least have the decency to choose a proper name or handle for this forum.
Secondly, for this requirement you'd use a level-based measure in the RPD which aggregates at the "Branch" level of your hierarchy or you can use the AGGREGATE AT function in Answers.
First of all I'm sorry for inconvenience words in my thread.I did'nt mean to be that way.it's just a mistake in choosing the proper name.
Secondly, thanks alot for the solution you gave me.million thanks.
No worries, just a question of netiquette in the forums.
If that has solved your issue, please close this thread as currently it's still marked as
This question is Not Answered.
and by closing it you assure that other people searching for a valid response will know that one is contained in here.