Change Time Horizon

Select Datasets > Properties .
The Dataset properties dialog box is displayed.
Select the CTH/Periods tab.
On Changeable Time Horizon, click Define.
On Time Horizon, select the forecast you want to change then specify the changes for the Time Horizon. You can change the Name, Mode, Scope, and From/To Period.
Click Save.
Optionally, click Time mark to change the time marks.