Selecting the Face, Edge, Vertex, or Object Behind

To select the face, edge, vertex, or object, behind another selected face, edge, vertex, or object, do one of the following:

From the menu bar, click Edit> Next Behind.
Right-click in the Modeler window and choose Next Behind from the shortcut menu.
Press the B shortcut key.
Press Ctrl+B.

Note:

The desired entity must be behind the point where you clicked, not just behind the initially selected face, edge, vertex, or object.

This option is useful when you are trying to select a face, edge, vertex, or object that is in the interior of a model, or when you do not want to change the model viewpoint to select an item.