Select an editable poly object. > Modify panel > Polygon sub-object level > Edit Polygons rollout > MSmooth Settings button
This dialog lets you specify how mesh smoothing affects editable polys.

MeshSmooth—Smoothes the selection using the current settings.
Smoothness—Determines how sharp a corner must be before polygons are added to smooth it. Smoothness is calculated as the average angle of all edges connected to a vertex. A value of 0.0 prevents the creation of any polygons. A value of 1.0 adds polygons to all vertices even if they lie on a plane.
Separate by Smoothing Groups—Prevents the creation of new polygons at edges between polygons that don't share at least one smoothing group.
Separate by Materials—Prevents the creation of new polygons for edges between polygons that do not share Material IDs.
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