Hello,
Hope you can help me to find out what tool can I use to add a column where it Counts 1 when find an unique record based on 4 variables and count 2+ when find a duplicate record based on the same 4 variables.
Please see the image below:

There are 3 records with the same value at Num_Cheque, di_institucion, di_nombre and Min_Fecha Proceso. I want to add a column that shows a 1 in the row of the record # 11, a 2 to the record #12 and a 3 to the record #13.
Thanks a lot, greetings from Panama.