There are different variants how to do an activity planning.
a) Some schools try to keep always the same activity planning. That is easy, because normaly not many changes are needed. The disadvantage is, that students (always) get new teachers.
b) Some school try to move the activity planning one year up, so teachers keep the students.
c) Some do a mix of both. Maybe Move year 5->6, 7->8 and 9->10. But not 6->7 nor 8->9.
If you do variant b) (or c) you might be happy about the new feature in the new FET snapshot. Please test it and report if it is working well. Since it is a bit "hidden" (no new button, ...), I describe it.
Go to FET->Data->students->year.
Select the highest year and "rename" it (or remove it, if you are sure you won't need that activities/constraint for your new lowest year again). Rename it with a temporary unique name.
For example: year "10" -> year "11"
Then select the second highest year and rename it "up" also. Example: "9" to "10".
Go on down to the lowest year. Then maybe rename the highest "temporary unique name" year with the lowest year name.
I hope some schools will be glad to have this feature. (I know it isn't used at many secondary school, but primary schools or similar schools often do the activity planning like that.)
Don't forget that you can modify the "split year automatic" without removing the year if you need new courses. Liviu coded that feature already some time ago. Please test that feature too.
Happy timetabling!