To update the class section structure, follow these steps:

1. Go to the "Class Section Structure" section under the "Masters" menu.
2. You will see a class-wise listing of available classes.
3. Select the desired class for which you want to update the class section structure.
4. Click on the pencil icon under the "Action" column for that class.
5. Update the class sections as needed.
6. Once you have made the necessary changes, click on the "Submit" button to save the updated class section structure.

By following these steps, you can easily update the class section structure for a specific class, ensuring accurate and up-to-date class section information in the system.