Use Constraining Polygons: Use this option to specify a region of seed points to use for the grid.  If using an Inclusion/Constraining Polygon only the seed points within the polygon will be used to create the grid.  If using an Exclusion/Constraining Polygon only the seed points not within the polygon will be used.  This polygon will not affect the size or shape of the output grid.  It is common to use both a Constraining and Clearing polygon to specify the seeds points to use, then clear the grid to match the shape of the polygon.

Use Clearing Polygons: Once the grid is created this polygon will be applied to clear parts of the grid.  If using an Inclusion/Constraining Polygon all parts of the grid will be cleared except for what is within the polygon.  If using an Exclusion/Constraining Polygon everything will be kept except for what is in the polygon.  It is common to use both a Constraining and Clearing polygon to specify the seeds points to use, then clear the grid to match the shape of the polygon.

Use Fault Polygons: Use this option to define fault regions. When gridding seed data points that are across a fault they are ignored and not used to determine grid values.