Classroom column This way is simple and clear. You can add one more column into the substitution reports that shows classrooms:
Class column If you decide not to use the classroom column, then the classrooms are printed into "Class" column. However they are printed only if there is a room change or if the lesson is not in the homeclassroom:
This second aproach can be used to save some space on smaller schools, where the teachers know the homeclassrooms.