How to use the Blind Buried vias in the simple 6 layer board.

Hi..

I have completed to work on the two to four layers boards with the through hole via. So i am now just had to start  work with PCB editor.
Still me was know to how to configure the blind and buried  vias in the PCB editor. So me was interest to work on the six layer board with the BB vias with PCB editor.

So can anyone provide the basic idea to work on the BB vias on Allegro PCB editor.

Thanks & Regards
Dhamodharan