To delete a photometric calculation schedule from the drawing, go to
Ribbon: DM Electrical->Point-by-Point Photometrics-> 
Delete Photometric Calculation Schedule
Pulldown Menu: DM Electrical->Point-by-Point Photometrics->Delete Photometric Calculation Schedule
You will be prompted to identify which photometric calculation schedule is to be deleted.
Select schedule to delete:
The photometric calculation schedule will be removed from the drawing.