Truncate SurfaceKeyCreator \ Modify \ Surface \ Truncate-Surface
Use this function to reduce the amount of information required for surface storage by eliminating general areas that are not needed.
For example, a surface is supplied through an 'IGES' file that represents a large sec tion of an aircraft's exterior. Only a small section of the surface is needed for a particular task. If the entire surface is used all operations referenc ing that surface such as intersection for flow-line display will take longer to process and will return much more data than is needed. This may slow down KeyCreator activities and may necessitate extra work for you.
Using the Function:
Choose Method to Define Surface Corners