To add class section structure, follow these steps:

1. Navigate to the "Class Section Structure" section under the "Masters" menu.
2. Look for the option to "Add Class Structure" and click on it.
3. Enter the class names and corresponding sections in the provided fields.
4. If you need to add multiple sections for different classes, you can enter the details accordingly.
5. Once you have entered all the classes and sections, click on the "Submit" button to save the class section structure.

By following these steps, you can easily add class sections for different classes in one go, streamlining the organization of sections within the system.