CATCHING DUPLICATE INFORMATION IN DIFFERENT CELLS SAME PROGRAM

G

Guest

I am working in excel and need to have a warning when information previously
keyed is being duplicated in the same colums. Example: column B is always
ticket numbers. I want excel to warn me if while keying in column B I key
the same number in a different cell. I want this restricted to certain
columns not the entire workbook.
 

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