Deselect

Objects can be deselected one at a time by left clicking on the selected objects. A more powerful way to deselect items is to use the Select menu commands and the Deselect button on the associated form (e.g., the Select menu > Select > Select by Object Type command displays the Select by Object Type form, which has Select, Deselect and Close buttons; select the objects and click the Deselect button).

Alternatively, the Select menu > Deselect commands can be used along with the Deselect button. The Deselect commands provide access to most of the selection methods available on the Select menu, except that now they are used to deselect rather than to select. For example, assume that all of the objects in a model except for those in a particular XZ plane are to be selected. To do this,  first use the Select menu > Select All command and then use the Select menu > Deselect > XZ Plane command.

See also:

Select at Pointer/in Window