Define the format.
Then use it with the variable.
proc format ;
value $GMB
'A','A2','A3','AA','B','B2','BA' = 'Good'
'C','C2','C5','CA','CC','CY','D','D2','D4','D5','DA' = 'Medium'
'E','E2','E4','EA','EC','EF','EM','G','GA','GY'
,'H','I','IF','J','JF','K','L','M','O','P1','S'
,'TP','U','U1','V','V1','W','Y','Z','Z1'
,'Z2','Z4','Z5','ZA','ZF','ZY' = 'Bad'
other = 'Unknown'
;
run;
proc freq data=dm.churn ;
tables CRCLSCOD ;
format CRCLSCOD $GMB. ;
run;
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