Use this procedure to specify the properties of one or more cut planes for a curtain wall style. Cut plane display properties apply only to display representations, such as Plan, that are used in Top view (Plan view) of a drawing.
To better visualize the elements of a curtain wall in Plan view, you can create cut planes. The main cut plane is where the shrinkwrap and hatching are applied. The plan display shows the components and objects in the wall as they are displayed at the height of each cut plane.
- Click
. 
- Expand Architectural Objects, and expand Curtain Wall Styles.
- Select the curtain wall style that you want to change.
- Click the Display Properties tab.
- Select Plan, and click
. Note: The Cut Plane tab is displayed only in some display representations, such as Plan. - Click the Cut Plane tab to set the cut plane to be displayed in each display representation for the curtain wall style.
- Enter a value for Cut Plane Height to specify the cut plane at which hatching takes effect.
- To specifically define a cut plane, click Add, and enter the height of the new cut plane.
If you add a cut plane … Then … at a height that is lower than the value for Cut Plane Height objects are displayed using the properties specified for the Below Cut Plane component on the Layer/Color/Linetype tab. at a height that is higher than the value for Cut Plane Height objects are displayed using the properties specified for the Above Cut Plane component on the Layer/Color/Linetype tab. 
Below and Above components
You can click Remove to delete a cut plane that you added.
- Click OK twice.