Every semester the class schedule is rolled from the prior like term. After a class section is created, you can edit any component of the section to ensure it is correct for the current term.
You should never edit the Start and End dates for a class as this is related to the term for which the course is created. All other fields can be edited UNTIL students begin registering for the class. Once a student enrolls in the course, the class association field can no longer be edited. All remaining fields can continue to be edited as needed.
Some common fields edited after a class is scheduled include: