Predefined values and filtering

I'm after some help with predefined lists and filtering options when a key value is selected.

I have set up a predefined list for town, post code and region

Value     LKey          LKey2                      LKey3

Town-A     Town-A        Postcode -A      Area-A

Town-B    Town-B        Postcode -B        Area-A

Town-C    Town-C       Postcode -C       Area-C

If a user select Area-A from LKey3, then I only want Postcode-A and Postcode-B to show from the remaining predefined values and vice-versa.

I am looking to do this on the joining pages of my site etc.

Many thanks in advance.

*BUMP*

Anyone any ideas????

Hello

You may take a look at our Dependent Fields and Self Manageable Dependent Fields modules. They allow to create dependency between different fields. If you have some questions feel free to contact me via internal mailbox.