data one;
input pulldate MMDDYY10.
tsippT 12-14
tsippC 15-18
count 20;
format pulldate date7.;
cards;
08/04/2006 34 24 1
09/25/2006 343 200 2
10/20/2006 678 398 3
11/03/2006 713 406 4
02/07/2007 857 451 5
;
run;

proc sort data=one;
by pulldate;
run;

data two;
set one;
by pulldate;
if first.count then sumT=0;
sumT+tsippT;
if last.pulldate;
run;

proc print data=two;
run;

http://jaredprins.squarespace.com/blog/2008/3/31/cumulative-totals.html

Cummulative Totals

SAS