Use the following options to set what happens when you select
.Select the way Maya considers intersections:
When Find intersection is set to Use direction, this option allows you to specify the direction.
X, Y and Z only consider curves that intersect along those axes respectively.
Active view only considers curves that intersect in the current camera view.
Free only considers curves that intersect along a custom axis you define in the Direction field below.
Select how the curve will be cut:
Select what portions of the curve to keep:
You can use this option to improve the precision of the primitive’s shape.
Global tolerance uses the Positional tolerance value in the Settings part of the Preferences window ( ).
Local allows you to enter a value in the Tolerance field to override the Positional tolerance value in the Preferences window.
Keeps the original curves and creates new curves from the cut.