Create panel > Geometry button > Extended Primitives > Object Type rollout > ChamferBox button
Create menu > Extended Primitives > Chamfer Box
Tab panels > Objects tab > ChamferBox Object
Use ChamferBox to create a box with beveled, or rounded edges.

Examples of chamferboxes
To create a standard chamferbox:
From the Create menu, choose Extended Primitives > Chamfer Box.
Drag the mouse to define the diagonal corners of the base of the ChamferBox. (Press CTRL to constrain the base to a square.)
Release the mouse, and move it to define the height of the box.
Click and move the mouse vertically to define the width of the fillet, or chamfer.
Click again to finish the chamferbox.
To create a cubic chamferbox:
On the Creation Method rollout, click Cube.
Beginning at the center of the cube, drag in a viewport to set all three dimensions simultaneously.
Release the button, and move the mouse to set the fillet or chamfer.
Click to create the object.
You can change a cube's individual dimensions in the Parameters rollout.
Cube—Forces length, width, and height to be equal. You can change a cube's individual dimensions in the Parameters rollout.
Box—Creates a standard chamferbox primitive from one corner to the diagonally opposite corner, with individual settings for length, width, and height.

Length, Width, Height—Sets the corresponding dimensions of the chamferbox.
Fillet—Slices off the edges of the chamferbox. Higher values result in a more refined fillet on the edges of the chamferbox.
Length, Width, Height Segs—Sets the number of divisions along the corresponding axis.
Fillet Segs—Sets the number of segments in the filleted edges of the box. Adding fillet segments increases the edge roundness.
Smooth—Blends the display of the faces of the chamferbox, creating a smooth appearance in rendered views.
Generate Mapping Coords—Sets up required coordinates for applying mapped materials to the chamferbox. Default=off.
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