So I have a table called "Dealerships" and a table called "Services". Each record in "Services" has a date, an amount, and a link to "Dealerships". I'm creating an interface that will aggregate these, so I can know the amount that came from each "Dealership". I know I can do this with a Rollup, but the problem arises when I try to use a Filter element in the Interface.
I have a "Dashboard" page and a "List" element sourced from "Dealerships". This list contains both the Dealership name and the rolled-up amount.
I need the user to be able to select a date range via a Filter and have the Rollup be updated to only add up the services that match those dates. I haven't been able to find a way to do this. The closest I came to a solution was to use 2 levels in the List, which actually DOES filter the services in the 2nd level but does NOT change the value in the Roll-up accordingly.
Any guidance would be greatly appreciated. Thanks!

