Main toolbar > Select Object
Use the Select Object button to select an object or objects for manipulation.
Object selection is affected by several other controls:
The active selection region type (Rectangle, Circular, or Fence).
The active selection filter (All, Geometry, Shapes, Lights, etc.)
The state of the crossing selection tool (which determines whether completely surrounded objects or surrounded and crossing objects are selected).
You can also select objects by name using the Select by Name list (Keyboard > H) .
A number of objects selected together are called a selection set. You can name selection sets in the prompt area of the toolbar.
Procedures
To add or remove objects from the selection set:
Hold down the CTRL key and select the objects to add or remove.
Adding or removing objects doesn't change a named selection set.
Holding down the ALT key also works to remove objects from a select set.
To toggle the selected/deselected state of objects in the selection set:
Hold down the SHIFT key and region-select (using a drag box) the objects to toggle.
To select objects and move, rotate, or scale them:
Use the Select and Move, Select and Rotate, or Select and Scale tools.
When you rotate a selection set, the pivot of rotation depends on which option is selected on the Use Pivot Point Center flyout on the toolbar. These tools are restricted to a specific axis or plane, which you choose from the toolbar.