creo9 config.pro option documentation for: INTF3D_IN_GPLUG_HIGH_DEG_SURF 
intf3d_in_gplug_high_deg_surf
yes
*
, no
Keeps high-degree B-spline surfaces in non-native gPlug parts that you import.
yes
- Preserves high-degree B-spline surfaces in imported models. This value is set by default.
no
- Approximates imported models M-^Y high-degree B-spline surfaces into third-degree spline surfaces.