Extruding Polygon Edges
Maya 8.0 Tutorial
How to Extrude Polygon Edges in Maya
Starting with a simple polygon object, you can extrude the exterior faces to add more geometry.
Another method of adding complexity to a polygon object is the append faces method. For more information, see topic Adding Faces to Polygon.
Using the Polygons menu set choose Mesh > Create Polygon Tool and draw a four sided polygon. Click four times in a counter-clockwise direction, then press the Enter key.
Switch to the Component Mode and activate the Edge Selection. Shift-click to select all the polygons exterior edges.
A second edge selection method is to choose Select > Select Border Edge Tool and double-click one of the edges.
With the edges selected, choose Edit Mesh > Extrude. Drag the extrude arrow in an outward direction. Press the q key to return to the Select tool and exit or press the g key to extrude again.