On the Manage Quizzes page, click on the quiz you want to add a random section of questions to.
Click Add/Edit Questions.
From the New button, click Random Section.
In the General area, enter your random section details.
In the Display Options area, select how you want your section to appear.
Click Save.
On the quiz question page, click on the random section you created.
Click Import.
From the Source Selection drop-down list, select the section you want to import.
In the Source Collection area, select the questions you want to import. Click Save.
In the Questions per attempt field, enter how many questions you want each user to see from the random section when taking the quiz.
In the Points each field, enter how many points you want each question to be worth. All questions in a random section are assigned the same points value.