Translations:Label sets/4/en
From LimeSurvey Manual
Label sets are list templates where each list has a set of codes with labels and can be used in most question types either as answers or as subquestions. Please bear in mind that LimeSurvey's label sets are merely copied to the particular question as subquestions or answers. Therefore, if you change a label set after you have 'used' it in a questionnaire, the changes will not propagate to the questions from the questionnaire where the respective label set is utilized.
This new usage of label sets gives much more flexibility for future development and makes the structure of a question more logical.