[themes] Function to print the secondary element of a non-active menu?

While using primary links with secondary links as sub-items, is there a function to print all the secondary links for a given non-active primary link? For example: -A |-1 |-2 -B |-3 |-4 -C |-5 |-6 Let us say I click on primary link A but I'd like to print somewhere on the page the secondary links under B (3 and 4). Is there a way to do it? My PHP skills aren't that great and I've been reading a lot about Drupal but I can't seem to find the function I need to do that. Thanks for any help. -- Dany V.