Simple:

proc forecast data=one method=expo trend=1 lead=24
  outall outlimit outactual outfitstats outresid out=fore outest=foretest;
  var invspace;
  id time;
run;

Holt:

proc forecast data=one method=expo trend=2 lead=24
  outall outlimit outactual outfitstats outresid out=fore outest=foretest;
  var invspace;
  id time;
run;

Winters:

proc forecast data=one method=winters trend=2 seasons =12 lead=24
  outall outlimit outactual outfitstats outresid out=fore outest=foretest;
  var invspace;
  id time;
run;