DropDowns - allowing each value to be used once

[Football Express]

In a 17 worksheet workbook I need to allow one of 32 possible dropdown
entries to be used but once. I have the custom validation box with the 32
entries in worksheet 1 but can not figure out how to eliminate the the
already used entry in worksheet 2, the used values in worksheets 1 and 2 to
not show up in the dropdown or worksheet 3, the used entries in worksheets 1,
2, and 3 not to show up in worksheet 4 and so on?
Any help appriciated.
PS: yup it's me again as football season draws near...

 

[T. Valko]

It's somewhat complicated to do for just one drop down list on one sheet.
So, you can expect it to be exponentially more difficult to do over 17
sheets. See this for a starting point:

http://contextures.com/xlDataVal03.html

 

[Don Guillett]

If we assume that you use the SAME dropdown list for all, you could have a
worksheet change event macro delete the selection. Biff's suggestion may be
better.

 

[Atishoo]

I think i would be tempted to use a combobox from the control toolbox then
give it a sub on click to move items from the list fill range

If we assume that you use the SAME dropdown list for all, you could have a
worksheet change event macro delete the selection. Biff's suggestion may be
better.