How to create sub-navigation in drupal?

Events happening in the community are now at Drupal community events on www.drupal.org.

Posted by vbose on June 18, 2012 at 12:52pm

Hi team,

I am facing problem to create the sub navigation in Drupal? Basically this navigation created under of my own module. For example like my link is example.com/?q=abc/program/123.
So if you see the attachment then u will get understand that I want to add new tab [Program 3] under of program tag. So could u tell me how to do it.

Please check the Program [Red mark] and then Program1 [green]

Thank you