Is it a character or numeric variable? Assuming it's character since you have leading zeros, then you can use the CAT() and CAT_() family of functions.
Is it a character or numeric variable? Assuming it's character since you have leading zeros, then you can use the CAT() and CAT_() family of functions.
data want; set have;
NEW_ID = catt("20", OLD_ID);
run;
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