Can I set booking percentage in Front Desk Software to a negative number to underbook a type of room?

Yes! eZee Frontdesk Configuration>> Property Setup >> Room Type >> Select particular rate type >> Edit >> Set Over BookingYes! eZee Frontdesk Configuration>> Property Setup >> Room Type >> Select particular rate type >> Edit >> Set Over Booking Percentage >> Save. Screenshot:

Front office staff are not able to see reports when they login software? – Reports privilege

Possibility 1: User do not have rights/privileges for Reports. eZee FrontDesk Configuration>>Configuration Tab>>User (Tab) >> SelectPossibility 1: User do not have rights/privileges for Reports. eZee FrontDesk Configuration>>Configuration Tab>>User (Tab) >> Select User >>Edit >> Reports Privilege >> Check Mark reports >> Save. Screenshot: