I have requirement as Forecast Vs Actual by Timeline.
For Timeline i have created Drill Down which contains Year,Quarter,Month,Week and my bar graph have two measures one is for Actual and other for Forecast. My requirement is when i drill from Year to Quarter (Similar for Quarter to Month to Week) then business want to change bar colour for both (Actual and Forecast).
We can keep bar color based on dimension (only when we have single measure), but I don't know think there is an option to change the bar color based on drill down. However, you can use custom color as 'Multicolored' but the color of actual and forecast will remain same over the drill down.