When you add datum elements (grids, levels, and reference lines) to a project, they can display in more views than desired. For example, when you add grid lines to a plan view, the grid lines display in all plan views of the model. However, you may want the grid lines to display in only certain views. This is exactly what a scope box is for: to specify the views in which the datum elements will display.
Scope boxes control the visibility of datum elements in views whose cutting plane intersects the scope box. Scope boxes are particularly useful to control the visibility of datums that are not parallel or orthogonal to a view.
For example, the following floor plan shows a science center with an aviary wing at an angle to the main building. The main building and the aviary wing use different grids. The matchline indicates where this floor plan is divided into dependent views, to show each part of the building on separate sheets. (See .) However, on the dependent view for the aviary wing, you do not want to show the grid lines for the main building. On the dependent view for the main building, you do not want to show the grid lines for the aviary wing. You can accomplish this using scope boxes.