DATA _null_;
CALL SYMPUT('testVariable','testValueText');
;RUN;
In the example above, %PUT &testVariable; will resolve to testvalueText.
You may find the need to format your variable within the SYMPUT() call.
DATA _null_;
CALL SYMPUT('testDate',COMPRESS(PUT(today(),date9.)));
;RUN;
In the example above,%PUT &testDate; will resolve to 10MAR2017