Another play to try, which can be copied straight down from the starting
cell, and even beyond existing data in the col (in readiness for future data
<g)

With source data in A1 down,
Put in B1: =IF(A1="","",COUNTIF($A$1:A1,A1))
Copy down as far as required
--
Max
Singapore
http://savefile.com/projects/236895
xdemechanik
---
"Bob Stearns" wrote in message
. ..
I would like to automatically number the occurrences found in column A in
column B. For example:

A1: One B1: 1 (First occurrence of One)
A2: One B2: 2 (Second occurrence of One)
A3: One B3: 3 (Third occurrence of One)
A4: Two B4: 1 (First occurrence of Two)
A5: Two B5: 2 (Second occurrence of Two)

I am partially there using:
B1 =IF(A1<"",COUNTA($A$1:A1)&".","")
B2 =IF(A2<"",COUNTA($A$1:A2)&".","")
B3 =IF(A3<"",COUNTA($A$1:A3)&".","")
B4 =IF(A4<"",COUNTA($A$1:A4)&".","")
B5 =IF(A5<"",COUNTA($A$1:A5)&".","")
but, I need to somehow add the conditional if A changes B restarts
numbering
at 1. The file I'm going to copy into column A contains about 3,000
lines/rows.

Thanks for your help...