proc format library=work.formats;
value $sexe "M" = "Homme"  "F" = "Femme";
  value rage   11 = 'very jeune' 12 = 'very jeune'
               13 = 'adapted'  14 = 'adapted'
               15 = 'retard' 16 = 'retard'
                        other = 'special'

             ;
run;
data class;
set sashelp.class;
format sex $sexe. age rage.;
run;

data classadd;
name="unknown ";
sex="M";
age=17;
run;

proc append base=class data=classadd;
run;

options fmtsearch=(work.formats);
proc export  dbms=sav data=class outfile="c:\temp\afterHFc70003other.sav"
replace;
fmtlib=work.formats;
run;