Before attributes can be added to a course, the attribute must be created.
Navigate to the course or to your product.
Click on the "Edit" tab.
Click on the "Pricing" tab.Click on the "Attributes"
vertical tablink at top left.
Click on the "add attributes to this product" link.
Check the checkbox next to the desired attributes.
Click "Add attributes."
Add attribute pricing optionsTo disable options for the selected attribute click on the "Options" link.
The final step is to add the pricing adjustments for each option.
To add a new attribute see creating pricing attributes.