You can delete an unprepared bid period. Prepared, active, and deactivated bid periods cannot be deleted.
To delete an unprepared bid period:
Switch to the Periods tab.
Select the bid period you want to delete.
Click the Delete button. The N-PBS Scheduler warns you that deleting the bid period also deletes all data relating to it, and asks you to confirm the deletion.
Click OK.
The N-PBS Scheduler deletes the period and all related data.