The first action allows to drag and drop elements. So, let's drag and drop a Part, a second part,   and a third one. Drag and Drop 5 Questions in each part,   the first one, second one, and the third one. Let's add the other questions  types in the first part.  Drag and drop a Subquestion,   and the Blank one. Click on the preview to see changes, and  this is the list of all the made questions.

Drag and Drop Elements

Queezed - Make & generate unique quizzes into PDF | Product Hunt