excel 2007 - how do i generate a sequential number within an IF formula?

[tom BTV]

Column A, B and C are values which describe a product. I want column D to generate a sequential number based on the contents of a given cell in column A. Together the four values make up the product code.

Column A: Location

Column B: Species

Column C: Date

Column D: Reference Number

There are multiple locations which will fill the cells in column A. I want the reference number sequence to begin with 1 for each location. My approach is to use a nested IF formula to isolate the locations, but I can't figure out how to generate a unique sequential reference number. Any thoughts?

-Tom

Burlington, VT

[djapigo]

Hi Tom,

Use a combination of concatenations and Vlookups for the Location...

Please show an example to make sure, I'm going the right path...

Thanks,
Dennis

[Haseeb Avarakkan]

Hello Tom, welcome to the forum.

Assuming data starting from A2 to down. In D2 use

=IF(A2="","",COUNTIF(A$2:A2,A2))

Then drag down as needed.

[tom BTV]

That works great! Thank you so much.

[Cutter]

@ tom BTV

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