new post only for its forum & sub

[white_tiger]

hello
i need a mod for VB 3.5
case :
Forum ABC
-- Category 1
---- Forum 1
---- Forum 2
------ SubForum 1
------ SubForum 2
---- Forum 3

if i were at Forum 1, then i click new posts, it will show all new unread post in forum 1
if i were at forum 2, then i click new posts, it will show all new unread post in forum 2, subforum 1, and subforum 2
if i were at category 1, then i click new posts, it will show all new unread post in forum 1,2,3 and subforum 1,2

anyone have created this mod ?