Cond display of drop down based on value selected in another drop down form

Hi,
I have a requirement in my app in which I need to be able to conditionally display the values in the drop down down list based on the values selected in another drop down list...
Currently I have 2 drop downs.
First drop down is a list of Jacks from 2000 to 4999...
Second Drop down consists Chassis ranging from 1 to 900..
So when a user selects any jack between 2000 - 2999, in the second drop down only Chassis ranging from 1 to 300 should appear.
when anything between 3000 - 3999 is selected, Chassis ranging from 301 to 600 should appear..
and for jacks between 4000 - 4999, Chassis ranging from 601 to 900 should appear in the second drop down.
Can someone please provide me pointers on how to do this..
Thanks,
Nehal

Hi Larry,
Thanks for your response..
Here are the queries for my select lists.
P62_JACK
select list query for Jacks:
select JACK_NUM display_value, JACK_NUM return_value
from CTS_LIST_OF_JACKS
order by 1
P62_CHASSIS_BLADE_PORT
select NETWORKPORT display_value, NETWORKPORT return_value
from CTS_LIST_OF_NETWORKPORTS
order by NETWORKPORT_ID
jacks range from 2000 to 4000
chassis_blade_port ranges from 100 to 900...
Can you please let me know how to do it..
Thanks,
Nehal

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ok, sorry everyone for making it confusing; this is what I am
trying to acheieve;
I would like the user to populate my database with thier
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dynamicly populated already, what I am trying to achieve, is a way
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Does that make sense....?

How to populate a dropdown box based on a selection in another Dropdown box.

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Basically, within my code, I start by invoking the method
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Hope this makes sense. If not, please let me know.
ds

Cond display of drop down based on value selected in another drop down form

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