The Ellipse cross-section may be found in the Type drop-down menu. An elliptical section has a specified height and width and will be located according to the XSec parameters at that station. An Ellipse of zero height or width will collapse the cross-section to a line which may be used to close a body. Setting both height and width to zero will collapse to a point. In this case, simply change the type to Point rather than setting the dimensions to zero.