data have;
input name $ id (Location_1-Location_3)(:$1.);
datalines;
STEF 1001 Y N N
JACK 1002 N N Y
MADDY 1003 Y N N
JEFFY 1004 N N Y
BEN 1005 N N Y
LAMAR 1006 Y N N
;
data want(drop=name location_:);
set have;
array l {*} Location_1-Location_3;
location = vname(l[whichc('Y', of l[*])]);
run;
Result:
id location 1001 Location_1 1002 Location_3 1003 Location_1 1004 Location_3 1005 Location_3 1006 Location_1
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