I changed the calculation you had for MovingBooked to:
MovingAverage stayed the same:
Then I created a field that subtracted the two:
Then I created a TF calculated field to filter only the month that is selected in the Parameter and added to the filter:
Hope this helps!
Difference Example.twbx 186.9 KB
Thank you so much for your help, Walt! The step by step explanation really helped me understand what you were doing and I've been able to replicate without any issues.
Thank you again!