I'm working with a client who has an interesting request. They like the High-Level/Low-Level relationship that the Roll-Up Multiple Boards feature provides. However I was wondering if there is a way that we can apply a low level filter that will aggregate a timeline back up to a high level item. So for example I can have a campaign board that had multiple months as groups, then create a dropdown with each value representing each month. Then on the High Level board we could have an item the represents each month for the campaign giving them the information rolled up based on the filter to each line item that matches the month. I hope that makes sense. I would love to hear your thoughts.