Not sure if there are any functions to get them directly, but you could get them from Distribution platform for example
Names Default To Here(1);
dt = Open("$SAMPLE_DATA/Consumer Preferences.jmp");
dist = Distribution(Multiple Response Distribution(Column(:Floss Delimited)), invisible);
vals = Report(dist)[OutlineBox("Frequencies"), StringColBox("Level")] << get;
dist << Close Window;
show(vals); // vals = {"After Meal", "Before Sleep", "Other", "Wake"};
This won't catch missing values and it will have to be checked separately from the report.
-Jarmo