When Surface/Surface Intersection is selected from the Create>Advanced Splines submenu, the following dialog appears.

 

Dialog Options:

 

Intersection and Fit Tolerance

Specify and Intersection and Fit Tolerance value.

Maximum Step Length

Specify a Maximum Step Length

1st Surface Offset Value

Specify an offset value for the first surface.

2nd Surface Offset Value

Specify an offset value for the second surface.