Related Questions:
Where Do I Put The Lost Reason When I Move a Booking to Lost in the Pipeline Stage?
Why isn't my Lost Reason showing when I update the Booking Stage?
Environment:
Event Temple Web App
Answer:
You can only select a Lost Reason when changing a Booking's Status (rather than Pipeline Stage).
Once you change the Booking Status to Lost, you will be prompted to fill in the Lost Reason.
Additional information:
If your Lost Reason is not listed in the Picklist, pressing the Manage Lost Reasons button will take you to the Lost Reasons Settings Page, where you can add a Lost Reason. Please note, only users with admin user roles can manage Lost Reasons.