Use the Select menu > Select > Assignments > Joint Supports command to select objects based their joint support assignments.
Click the Select menu > Select > Assignments > Joint Constraints command to display the Select Supported Joints form.
Select the Supported Degrees of Freedom and the type of Support (Restraints, Joint Springs, Line Spring Support Joints, Area Spring Support Joints and so on) by checking the appropriate check box.
Click the OK button. All support joints matching the specified criteria will be selected.