Beveling involves first extruding polygons and then scaling the extruded polygons. Use these settings for beveling polygons in Interactive Manipulation mode.
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Select an Edit Poly or editable poly object. >
Modify panel > Polygon sub-object level > Edit Polygons rollout > Bevel > 
(Settings)
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Select an Edit Poly or editable poly object. > Polygon sub-object level > Quad menu > Tools 2 quadrant > Bevel > (Settings)
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Select an Edit Poly or editable poly object. > ribbon > Modeling tab > Polygon Modeling panel >
(Polygon) sub-object level > Polygons panel > Shift+click 
(Bevel) or choose Bevel Settings from the drop-down list.
Interface
Bevel Polygons uses the caddy interface when Enable Caddy Controls is on; when off, the standard settings dialog is used. For details on using the caddy controls, see The Caddy Interface.
Left: the caddy interface; Right: the standard dialog
- [Bevel Type]
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From the drop-down list, choose the method for beveling multiple polygons at once:
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Group Beveling takes place along the average normal of each contiguous group of polygons. If you bevel multiples of such groups, each group moves along its own averaged normal. -
Local Normal Beveling takes place along each selected polygon's normal. -
By Polygon Bevels each polygon individually.
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Height -
Specifies the extent of the extrusion in scene units. You can extrude selected polygons outward or inward, depending on whether the value is positive or negative.
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Outline Amount -
Makes the outer border of selected polygons bigger or smaller, depending on whether the value is positive or negative.
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OK -
Applies the settings to the current selection and closes the caddy. Keyboard equivalent: Enter
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Apply and Continue -
Applies the settings to the current selection, retaining them for the preview if you then change the selection. Keyboard equivalent: Ctrl+Enter
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Cancel -
Closes the caddy without applying the settings to the current selection. Does not reverse previous uses of Apply And Continue. Keyboard equivalent: Esc