You can use formats to have character values displayed for numeric values. If you already have the data set created, you can run code similar to the following in a Program Editor:
libname myfmtlib " /* path to folder to save format definition */ ";
proc format library=myfmtlib;
value myscale 1='Extremely likely'
5='Kind of likely'
9='Extremely unlikely'
other='n/a'
;
run;
options fmtsearch=(myfmtlib);
data libref.newdata;
format /* name of numeric columns you want format applied to */ myscale.;
set libref.olddata;
run;
After creating this data set libref.newdata that has the format applied, you will need to run and save this code in your Project Start Code in Enterprise MIner:
libname myfmtlib " /* path to folder to save format definition */ ";
options fmtsearch=(myfmtlib);
Then you should be able to create a data source in Enterprise Miner for this new data set, and run flows as usual.
Hope that works for you!