Select Object lets you select an objects and sub-objects for manipulation.
Object selection is affected by several other controls:
You can also select objects by name with the Select From Scene dialogSelect From Scene list; press the H key to access the dialog.
A number of objects selected together is called a selection set. You can name selection sets in the Named Selection Sets field on the main toolbar and then recall them for later use.
To add objects to a selection set:
To remove individual objects from a selection set:
To select objects and move, rotate, or scale them:
 
  
  Use Select And Move, Select And Rotate, or Select And Scale, available from the main toolbar and the quad menu
 Use Select And Move, Select And Rotate, or Select And Scale, available from the main toolbar and the quad menu  Transform quadrant.
 Transform quadrant.
                  When you rotate a selection set, the pivot of rotation depends on which option is selected on the Use Center flyout on the toolbar.
These tools are restricted to a specific axis or plane, which you can choose from the Axis Constraints toolbar or specify with the transform gizmo.