Good question that.and yes it can be done fairly easily. Give this a try. Create a shape on the "Route Keepout All Class" Right click on the shape and set the following properties. Routes Allowed, Vias Allowed. When you create a route keepout shape it will clear copper planes if the copper plane is dynamic so basically you have voided copper. The properties of the Route Keepout when set can allow Routes or traces and vias to exist within the Shape / Voided area. Let us know if that works for you.
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