Copy the script to a text editor (I personally like BBEdit, but anything that will save a plain text file will do. TextEdit will work fine on Mac).    Save it using a name of ClassDescription.txt to:   /Users/Your User Name/Library/Application Support/VectorWorks/2017/Libraries/Defaults/Reports_Schedules   Then set the formula to add the code (120) for the location you have the saved the txt file.   =RUNSCRIPT(120, 'ClassDescription')     Be