Polynomial to nominal?

hi,

in the Logistic Regression, Sonar dataset has nominal data type as label... however when I import data from excel, I cannot choose data type nominal... however, logistic regression does not allow polynomial dataset as its not supported.. so what to choose then?

I find that really confusing.. in RM 5, you could choose nominal data type, is this only available in commercial releases or what happened?

is there a workaround for that?