To create section first you need to create a test or open the existing test.
From admin dashboard go Courses > Tests > Test builder (Note:You have to first create the section to add questions to it)
In test builder click on section button or drag and drop the section button to right panel.
In the next screen, you can change the name of the section and click on save.
Note: We currently allow a maximum of 15 (fifteen) sections within a quiz.