Thanks Astounding!
Your last post clarified the last couple points I was getting hung up on and I was able to make the few changes I needed to get the program to run. Thanks for also explaining the different styles or arrays and the advantages of using the style you suggested.
This is much, much easier if you have your data in a long format rather than a wide format. As mentioned, only exact matches will be found.
If you transpose your data and place the codes you're looking for into a dataset, list_chosen then this would work:
proc sql;
create table want as
select *
from have
where idx in (select idx from list_chosen);
quit;
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