[[Image:cad_manual-0_new.png|thumb|360px|CubeCAD's Navigation Tree.]]
[[CubeCAD]]'s Navigation Tree groups and organizes objects using a hierarchical system. Located at the top of the Navigation Tree and under the CubeCAD icon are two main groups: '''Geometrical Construction''' and '''Data Visualization'''. Under Geometrical Construction, you create or import and manage CAD objects. Under Data Visualization, you create or import and display 3D representations of real, complex, scalar or vector data in a variety of formats. The Data Visualization group and its usage will be discussed later in this manual. The next sections of the manual will present a detailed discussion of CAD objects, their creation, transformation and management.
'''Geometrical Construction''' (represented by the [[File:physstruc_tn.png]] icon) contains the '''Parts''' that form a structure. '''Parts''' (represented by the [[File:layer_tn.png]] icon) contain all the native objects that you draw in CubeCAD's project workspace as well as all the CAD objects that your import from supported external CAD files. Parts are made up of one or more colors. CubeCAD's objects are grouped by '''Color''' represented by the [[File:coloricon_tn.png]] icon. You can create many colors and add objects to each color group. All the objects belonging to a '''Color''' literally share the same color or texture. When you start [[EM.Cube]] for the first time and draw a new object in CubeCAD, a default color named "Color_1" is immediately created to hold your new object. The default color is grey. You can change the name, color or texture of this default group or add new color groups. To create a new Color, right click on the '''Parts''' item of the Navigation Tree and select '''Insert New Color...'''. A dialog opens up that contains a default name for the new color. Accept the default name or type in a new name for the new color group.