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Toposurface subregions are areas that you sketch inside existing toposurfaces. For example, you can use subregions to draw parking lots on a graded surface, roads, or islands. Creating a subregion does not result in separate surfaces. It merely defines an area of the surface where you can apply a different set of properties, such as material.
To create a subregion
- Open a site plan that displays a toposurface.
- Click Site tabModel Site panel (Subregion).
Revit LT enters sketch mode.
- Click (Pick Lines) or use other sketch tools to create a subregion on the toposurface.
To modify subregion boundaries
- Select the subregion.
- Click Modify | Topography tab Subregion panel (Edit Boundary).
- Click (Pick Lines) or use other sketch tools to modify the subregion on the toposurface.
The following image shows a toposurface that has a subregion, shown in gray.