Finding duplicates and assign the corresponding concatenated values

One Way... in F2 copied down:
=IFERROR(INDEX($A$2:$A$41,MATCH(0,INDEX(COUNTIF($F$1:$F1,$A$2:$A$41),0),0)),"")

The a bit of code...

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How to install your new code
Copy the Excel VBA code
Select the workbook in which you want to store the Excel VBA code
Press Alt+F11 to open the Visual Basic Editor
Choose Insert > Module
Edit > Paste the macro into the module that appeared
Close the VBEditor
Save your workbook (Excel 2007+ select a macro-enabled file format, like *.xlsm)

Then use this array formula in G2, copied across and down:
=ConcatAll(IF($A$2:$A$41=$F2,B$2:B$41,""),", ")

Array Formulae are a little different from ordinary formulae in that they MUST be confirmed in the FIRST CELL ONLY by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. After that, the array can be dragged down as normal, to cover the desired range.

You will know the array is active when you see curly brackets { } - or "curly braces" for those of you in the USA, or "flower brackets" for those of you in India - appear around the outside of your formula. If you do not use CTRL+SHIFT+ENTER you will (almost always) get an error message or an incorrect answer. Press F2 on that cell and try again.

Don't type the curly brackets yourself - it won't work...

You're welcome.

If it's too slow getting the uniwue values, let me know ....

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