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What technology are you using for your UI?
If OA Framework - try their forum.
If JSF/ADF Faces, have a search on this forum (or the standard JDeveloper forum) for "dependent listbox" "dependent drop-down" or similar topics to find out the solution (this is quite likely the single most asked question on this forum).
If something else, please share.
See this Oracle Magazine article for a how-to:
[Defining Cascading List of Values | http://www.oracle.com/technology/oramag/oracle/07-sep/o57frame.html ]