Hi,
By "constants', do you mean duplicates? If so, the attached workbook should solve your problem.
The purple cells contain the array formula to create a list of items in column A that match up with duplicate entries in column B (note that the formula extends longer than it necessarily has to). I have then created a named range (called "DataList"), which takes all of the purple cells and ignores the blanks at the bottom of the list, using the OFFSET function. This named range is then the source of your data validation list in the orange cell. Note that the purple column can be hidden if necessary.
I hope this helps
P.S. Might I also add...how good is bacon and cheese!?!?!?!?![]()
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