Use Existing Surface Reference

Specifies the existing surface as the patching or runoff surface.

Access:
	On the Core/Cavity tab, click Use Existing Surface.

Select	Surfaces Specifies a set of surfaces in the graphics window. To remove surfaces, hold down CTRL and click them.
Output	Patching Surface Specifies the selected surface to convert to a patching surface. Runoff Surface Specifies the selected surface to convert to a runoff surface.
	Expands the dialog box to display a list of selected surfaces.
Surface	To remove one or more surfaces, select them from the list and click the Delete key, or right-click the selected surfaces, and then click Delete.