This code here immediately looks suspicious - note use the code window - its the {i} or the SAS program icon above your post to put code in as this keeps formatting (i.e. indentations and such like):
data sum;
set mysas.test1 end=end nobs=nobs;
array orig(50) item1-item50;
array sums(50) sum1-sum50;
do i = 1 to 50;
sums(i)+orig(i); <--
end;
On the row indicated you don't assign anything, maybe you mean sums(i)=<something> + orig(i)?
Also, its a good idea to post a small bit of test data, in the form of a datastep, and what you want the output to look like otherwise we are just guessing with no baseline.
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