You can seperate questions into different sub-sections (Groups) within a Questionnaire.
This article will teach you...
How to add a group to a Questionnaire.
Select your New Questionnaire  from the Navigation tree and click the Add Group  button to open the Add Group window.
In the Add Group window give the new group a Name  and Description . Once completed set the Validation dropdown  to either answer all or not required.
- Answer all = All questions in the group must be answered before the questionnaire can be submitted
- Not required = Questions can be left unanswered and the questionnaire submitted.
Click Save when done.
The Description field has a 100-character limit.