is it possible to create line with 5in. width similar to shown in attached image
You can use the Shape.pathPattern: Custom Relationships
Try this:
var slashPattern =
$(go.Shape, { fill: null, geometryString: "M1 1 L6 10" });
myDiagram.linkTemplate =
$(go.Link,
$(go.Shape, { isPanelMain: true, strokeWidth: 10 }),
$(go.Shape, { isPanelMain: true, strokeWidth: 8, stroke: "white", pathPattern: slashPattern })
);
You’ll have to adjust the actual strokeWidth and geometry heights to match your model’s coordinate scale needs.