PICKADD (System Variable)

Controls whether subsequent selections replace the current selection set or add to it.

Type:	Integer
Saved in:	User-settings
Initial value:	2

0	Turns off PICKADD. The objects most recently selected become the selection set. Previously selected objects are automatically removed from the selection set.
1	Turns on PICKADD. Each object selected, either individually or by windowing, is added to the current selection set.
2	Turns on PICKADD. Each object selected, either individually or by windowing, is added to the current selection set. If the SELECT command is used, keeps objects selected after the command ends.

Note: You can add objects to, or remove objects from the selection set by pressing SHIFT while selecting. In AutoCAD, you can select the component subobjects of 3D solids, surfaces, and meshes by pressing CTRL while selecting.