If you have several different forms for different courses, use the Hidden field type to distinguish them from each other. Such a "label" will be invisible to the user but will get to the connected data capture services.
For example, you sell two courses: Master Class for Pastry Chefs and Master Class for Bakers. Your website has two forms that people use to enroll in your course.
To understand which master class your user has enrolled in, go to the Content of the form and add a new field of Hidden field type. Specify the variable name and its value.
Example:
Name: Course
Value: Dessert