How to access submenuitems at various levels in a master page from its content page?

I want to access submenuitems at various levels into a master page from its content page.Can any body tell me the complete process to access by creating an object of the submenuitem.Remember i'm talking about submenu items not menu control.
Thanx in advance.

moved to asp.net from vb forum

can u plz explain lil bit more.