First of all, it is important that you save all default questions. This can be done by clicking your right mouse button on the question. Choose Save as default question. Click in the header on the icon Manage my question sets.
Use your right mouse button to add one or more questions. A pop up appears with available default questions. Add the desired questions and click on OK.
Next time you create a form, you simply drag the created question set to the canvas of the editor. This way you do not have to add the same questions to the form over and over again. This saves you time.