To use Bevel tool inside modeler
Multiply > Modeler > Bevel or press (b)
If you would like to use the Bevel tool, the first thing to do is to choose the Modeler option from the Multiply menu. Later, you need to select the Bevel option or press (b) to select the Bevel tool. It’s used to extend the polygon surface so that you could add more level to the object as shown by the picture below.
You could use this tool to modify the existing model by creating another surface just like the sample shown in the picture above. After that, you just need to click and drag the mouse to create the surface.