Have you forget to say "Hello" ???
Even if I've deduce your request, you should be a little more clear.
To do this you can use the operator first. You should copy your table test BY area and add the statements :
if first.area then Sno=1; else Sno+1;
Regards,
Jbaax
data test;
input area $ no;
datalines;
A 10
A 20
A 30
B 10
B 20
C 30
;
run;
data want;
set test;
by area;
retain serno;
if first.area
then serno = 1;
else serno + 1;
run;
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