I have designed a questionnaire and in one "multiple short text" question with 4 Sub question , I want to make only name and email mandatory with email validation. Please guide is it possible or how can I do this.
The easy way is to create four single questions, but that probably doesn't look as good depending on your template and only work if you show group by group.
It can probably also be done using the expression manager, but I can't help you with that. Maybe somebody else can tell you.