Drag the path to the Symbols panel.
With the path selected, click the New Symbol button in
the Symbols panel or choose New Symbol from the panel menu.
The Bevel menu in the 3D Extrude & Bevel Options dialog box lists the bevel.
To apply the bevel to an extruded 3D object, select the 3D object, and then double-click the 3D Extrude & Bevel effect in the Appearance panel. In the 3D Extrude & Bevel Options dialog box, choose the bevel from the Bevel menu.
To apply the custom bevel to 2D artwork, select the 2D object, and then choose Effect > 3D > Extrude & Bevel. In the 3D Extrude & Bevel Options dialog box, choose the custom bevel from the Bevel menu.