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creo9 Drawing Setup option documentation for: HALF_VIEW_LINE            

half_view_line

Formats the line that designates a half view.
Default and Available Settings:
solid*
Draws solid lines where material is present.
symmetry
Draws a centerline extending beyond the part and acting as a break line.
symmetry_iso
Displays a half view symmetry line according to ISO standard 128:1982 5.5 - half view symmetry lines are displayed in yellow with thin linestyle, and the "hash" marks at the ends of the symmetry line are also yellow with thin linestyle.
symmetry_asme
Displays a half view symmetry line according to ASME standard ASME Y14.2M-1992 - half view symmetry lines are displayed in yellow with thin linestyle, and the "hash" marks are displayed in white with thick linestyle.
none
Draws the object a small distance past the symmetry line.
* 
When set to none, it is good practice to cut the view on a datum plane that is offset past the actual center line so the datum axis can be shown and the location of the part centerline will be clear. The cut will always be made on the datum plane selected.