Once you've customized your Master roadmap's pivots, you may want to customize your Master roadmap's layout and colors. 

Follow the same instructions as Format a Timeline's Layout and Colors or Format a Swimlane's Layout and Colors to pivot your data, then Color by a Field to add a further customization to your roadmap.

The same with Pivoting, if your Source Roadmaps share common fields, this will ensure all Items inherit color. If you choose to color by a field that is not shared across some or all roadmaps, the items that are not assigned a value will not inherit a color. 

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