How to show only active menu items

I'm using Accordeon menu, And I have sub menus till level 4. When I chose start level = 1, it shows all main menu together. Once selected, I want single main menu (level 1) on the page and all the submenus (of sub sequent level). Can you please tell to do that?
for eg.
right now,
A->a1->aa1,aa2
B->b1->bb1,bb2

I want, if page B is selected
B->b1->bb1,bb2

Hi
"hello" is a good starting point for a new discussion ...
then I think you should create a specific menu and module for each structure

1 for A->a1->aa1,aa2
1 for B->b1->bb1,bb2

then publish them and assign them to only show them when needed
CEd