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Numbering items for each subgroup within a larger list

hantran99 asked
Last Modified: 2013-11-16

I am looking for a way in SAS to do the following.

Say you have the following dataset

cust_number  transno
A   abc123
A   def456
A   fed666
B  bbb444
B  ttt567
B  ert444
B eee444
C tyk333
C kyt567

I would like to number all the records for each customers as follows:
cust_number  transno  transcounter
A   abc123  1
A   def456   2
A   fed666   3
B  bbb444  1
B  ttt567    2
B  ert444   3
B eee444   4
C tyk333  1
C kyt567  2

As you can see, I want to be able to number of observations in each subgroup (in this case customers)  1, 2, 3, 4 and so on and then restart from 1 again for the next customer or subgroup and so. How can I accomplish this in SAS.
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