Help with show_menu2 pls

[balvardo]

Help please.
I use show_menu2 and I have become the next problem.
I have a menu items A B S D F G. And there is still B1 B2 B3 B4 B5. It looked like:
A B S D F G
  B1 D2
  B2 D3
  B3
  B4
  B5
the first line displays feature: <?php show_menu2(0, SM2_ROOT, SM2_START, SM2_ALL); ?>
I need to display feature (B or B *) or (D or D *).
Are you understand me?
If I click on B or B* i always need to see B*
I hope you understand my terrible english.
   
Thanks in advance