COUNTIF - How to add sequence numbers within groups of repeating values

In Excel, I can apply sequential numbers within each group of values.

For example - Column A has groups of values which Column B applies sequence numbers to the members of each group.

Excel grouped sequence.JPG



The number sequence in Column B is generated by COUNTIF($A$2:A2,A2) which is copied in every cell in the column.

I see that Anaplan's answer to COUNTIF is to combine an IF THEN statement with the SUM function. How can this combination be used to create the grouped numbered sequence?


Thanks - Guy

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