Suppose you had the chosen values in a dataset have2 (completely made up based on the values you're displaying):
ID Selected
101 656
501 999
502 999
Then a PROC SQL left join will do the trick:
proc sql;
select t1.id, t1.value, t2.selected
from have as t1 left join have2 as t2
on t1.id = t2.id;
quit;
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