Mario explained :
Hi, I've searched previous posts as I know I saw the answer but can't find it
now and forgot to print it last time.

I'm inputting a number of part numbers (600 of them) in column A and need to
identify duplicates
as I enter them (on the fly).
Conditional formatting?

What I'd like is if I input a previously entered part number, any and all
occurrences of previous entries
of that part number to highlight so I stop double entries.

Please, not a macro as I'm not into macros yet.

I'm using Excel 2010 and also need the solution to also work on my other
machine using the 2007 version.

TIA.

Step1: Select ColumnA.
Step2: Open the CF dialog and enter the following formula:
=COUNTIF($A:$A,$A1)1
Step3: Set formatting to use shading OR bold, red font

This will flag the dupe AND its original entry.

--
Garry

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