Cube
Parameters Name, Material..., Path..., Show axes, Position, Angle, Scale are general for all objects. They are considered here.
Group Sizes sets the sizes of object. Group Elements defines a design of object.

Add cube

Sizes and Elements:
Depth: 0.20 Top
Bottom
Back
Left		 Top
Front
Bottom
Back		 Top
Back		 Width: 0.30
Right
Bottom
Left