How do you write a formula that takes the UNIQUE count of values in the summary. For example: Product A: Rep 1 and Rep 2, Total = 2 Product B: Rep 2 and Rep 3, Total = 2 Product C: Rep 4, Total = 1 At the summary level for all products, the count of reps would be 5 however, the count of unique reps is 4. How can you get the unique count of reps at the summary level?