You can compute percentiles, e.g., the lower and upper limit of an interval that contains 99% of the simulated totals (excluding only the lower and upper 0.5% tails of the empirical distribution), with PROC UNIVARIATE.
Example:
proc univariate data=sashelp.stocks;
var volume;
output out=perc pctlpts=0.5 99.5 pctlpre=p;
run;
Resulting dataset perc:
Obs p0_5 p99_5
1 4477828 140382836
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