We are creating some KPI reports from our Desk data and some of the fields on the Y-axis require formulas for them to be user friendly. For example the "Total Response Time in Business Hours" data is normally in milliseconds (ms) unit despite its name being "hours" and we need to use a formula on the Y-axis to transform this data into hours (hr) unit.

When you utilize 2 fields where one of them is a calculated from the other one then Analytics doesn't allow you to hide the original data field from the report because of the formula field. Is there some trick to hide the original graph (legend) from the report? This way the reports get both unreadable and also hard to understand for the managers.