This configuration allows you to configure these stages as well as allows you to add customized stages for booking.
Note :
By default there are 2 stages as Tentative and Confirmed and cancelled for booking.
In tentative stage, post-sales users can edit the cost-sheet if required and demand letters are not generated as booking is waiting for confirmation. Once booking is confirmed, cost-sheet and payment schedules gets finalized in which changes can't be done.