BuddyPress.org

Hello there,
I know that this issue has been posted somewhere before but as far as I saw this issue has not been resolved yet
in fact I am surprised that buddypress does not include such important feature !
I want conditional fields on my registration page based on a choice the visitor makes
for example
Your job: dropdown box contains {engineer, translator}
if the visitor selects engineer another dropdown will appear with the following options {computer, civil} else the child dropdown will have {En to Fr, En to Chinese}