Filter context is well observed in PivotTables. As an example, when you insert TotalCost to your Values space, after which you can increase Year and Area towards the Row or Columns, you're defining a filter context that selects a subset of data based on a given year and area. https://financefeeds.com/copyright-eu-taps-christian-derler-and-tamara-rubey-to-lead-commercial-and-legal-strategy/