Show Only Unused Data In Combo Box

Jul 29, 2005

Hi,

I'm wondering how to do the following:

I have two combo boxes that exist on a form record (i.e. two combo boxes for every record on the continuous form): mainCategory and subCategory.

Currently, I can choose a mainCategory and depending on the mainCategory, I have certain values available for the subCategory.

What I want to do is only show the values that have not been used for the subCategory (the mainCategory can always show its default value).

An example of what I mean is below...

The comboboxes and their row data:

mainCategory (combobox)
-------------
A (combobox rows)
B
C

subCategory (combobox)
-----------
for A: 1, 2, 3 (row for the selected mainCategory)
for B: I, II, III, IV
for C: red, blue

Sample scenario:
1. For the first record on the form, a user selects "A" from mainCategory and "1" from the subCategory for "A".
2. The user adds a new record to the form
3. For this new (2nd) record on the form, a user selects "A" from mainCategory and can only select "2" or "3" from the subCategory combobox. The "1" from the subCategory combobox is no longer available for choosing, unless the user changes the first record's "1" in subCategory to another value.

Any help would be much appreciated.

TIA!

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