Setting Access Control for Time Periods
Time Period controls access to time periods. If a user or group does not use the Change Time Period Information option, time period editing is restricted.
To set time period access:
From any view, select File, then File Management and then Access Control
In User Group, select a group to display its settings.
Select Change Time Period Information to enable options such as adding and deleting of time periods, label changes, and subperiod creation.