Click
Invert Orientation .
The Invert Definition dialog box appears.
In the To Invert box, select the surface or curve whose orientation is to be
inverted.
An arrow is displayed on the geometry indicating the inverted
orientation of the element.
Click the arrow to invert the orientation of the element.
Click OK to accept the inverted element.
The element (identified as Inverse.xxx) is added to the
specification tree.