I am working in Next Year Scheduling. If I changes classes here, will it affect my Current Year classes?
Classes are one of the things you can change
Classes are one of the elements you can change, because the Current Year list of classes and the Next Year list of classes are two different things. Courses, on the other hand, should not be changed.
There are six Tables which are shared between Next Year and Current Year. If you change an item on one of these tables, it changes in BOTH years. The six areas which are connected: