There is no built in support for this (no checkboxes for unique values,
sorted).
You would need to construct a unique sorted list in another location and
make that the source for your data validation.
You could adapt this code from John Walkenbach's site to create the list:
http://www.j-walk.com/ss/excel/tips/tip47.htm
--
Regards,
Tom Ogilvy
"Casey" wrote:
> Hi,
> I'm using a column on a worksheet as the source for data validation for
> another worksheet. The column used often contains double entries and the
> worksheet it is in is always sorted using criteria in a separate column. The
> result is that my Data Validation list is not sorted and contains duplicates.
> Is there a method for extracting the list for Data Validation and having it
> sorted A-Z using VBA? I should mention that the list is constantly being
> modified.
>
> Excel 97 on XP
> --
> Casey
>
>