Counter - based on criteria

[rowsont]

I need a formula to automatically generate the values in column C below,

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So to explain.....I have a spreadsheet with lots of postcodes in column A then a number of models of printers in column B, I want to generate a counter in column C that will create a numbered sequence for each model of printer at that particular postcode as per the above which I've manually done to illustrate.

Any ideas??

 

[StewartS]

You can use the countif function for this. You will need to concatenate the post code and number so it might be useful to add another column for post code and Number = A1 & B1 . the forumla will be
=countif(C1:$c$99,C1) Using an absolute formula for the last cell ensures it only counts each combination nce.

Stewarts

 

[CWatts]

Try this assuming all your data starts in row 1:

=COUNTIFS($A$1:A1,A1,$B$1:B1,B1)