I am not sure if there is a "termination" command - however, with careful planning you can achieve this through subsequent logic of other questions/groups. For example, I have a survey that has 83 possible questions - obviously, we do not want to ask all 83 questions if we can get away with a subset. Therefore, we ask a qualifying question that is an exclusion in all other questions. In this example, if the survey taker had taken a previous survey within six months we skip all but the last question.