Append the data set EXP.SUR to the EXP.RESULTS data set. The APPEND statement appends the data set EXP.SUR to the data set EXP.RESULTS. FORCE causes the APPEND statement to carry out the append operation even though EXP.SUR has a variable that EXP.RESULTS does not. APPEND does not add the WT6MOS variable to EXP.RESULTS.

   append base=exp.results data=exp.sur force;
run;