var fldLineDept = sublist.addField({
    id: 'line_department',
    type: ui.FieldType.SELECT,
    source:'department',
    label: 'Department'
});

fldLineDept.updateDisplayType({
    displayType: ui.FieldDisplayType.ENTRY
});

var fldLineClass = sublist.addField({
    id: 'line_class',
    type: ui.FieldType.SELECT,
    source: 'class',
    label: 'Class'
});

fldLineClass.updateDisplayType({
    displayType: ui.FieldDisplayType.ENTRY
});