You will see the above screen when you select: 3 lines > timetable construction > action > choose an action.
To roll over your current timetable for the next academic year, press the option 'Create new timetable'.
This will take your current live data and roll everything over for you. E.g. 1st year timetable will roll into 2nd year, 2nd year timetable will roll into 3rd year, 5th year timetable will roll into 6th year.
It is important that if you are creating a new timetable for 2019/2020 academic year that you create the timetable in the 2018/2019 academic year.
Also note that if you use the clone option and clone your currently published file, your data will not roll over and this will cause issues. There are some rare cases where a school needs to do this, but generally we advise to select the 'Create new timetable' option when getting ready for the next year.