If I remember correctly, I worked on ski areas last April and had to do set it up in Domain and then set it Field Type as a Text and then filled it out the codes and Description in the Subtype tab in the Feature Class Properties.
Then go back to the Geodatabase where you create a feature class and review the attribute table and see if you can have a scroll down the list of the the codes.
But to be honest I don't remember what I did LOL . I checked my file Geodatabase and trying to remember...
Let me know if I can help ...