On selecting the Cone option in the in the New Shape pop up menu, the Create Cone Volume Shape dialog will appear on the plot display.

Two separate locations (Start Circular Disc and End Circular Disc) and two radii (Start Radius and End Radius) based on the global cartesian coordinate system need to be defined. These can be entered manually into the dialog or the Display Point Tool option can be activated to graphically create the start and end points by dragging the ball to the appropriate location for each coordinate. Note that a representation of the cone can be seen by entering the Start Radius and End Radius values and pressing enter for each. Pressing the Apply button will create a new node called Cone 1 under the Volume Shapes node. This process can be repeated as many times as necessary to create additional cone shapes. Press the Close button to complete the operation.
The properties of the cone volume shape can be viewed and edited by clicking on the appropriate node under the Volume Shapes node.
