The Delete Class... menu item deletes one or more classes
  from a library. The class must be empty or CMS will not
  delete the class.

  When you choose Delete Class..., a dialog box appears,
  allowing you to specify options for the class you are
  deleting.

  To determine which generations belong to a class, do the
  following:

  1. Click on a class.
  2. Pull down the View menu.
  3. Choose the Expand submenu.
  4. Choose the Children menu item.

1  –  Dc cdb

  The Delete Class dialog box allows you to enter
  information about the class or classes you want
  to delete from the library.

1.1  –  Dc csf

  If you click on an object or objects before choosing
  the Delete Class... menu item, the Selected box contains
  those objects. CMS performs the delete transaction on the
  selected objects.

1.2  –  Dc cf

  Fill in the Class field with the name of one or more
  class expressions to be deleted from the CMS library.

  The class expression can be a class name, a wildcard
  expression, or a list of these separated by commas.

1.3  –  Dc crf

  Fill in the Remark field with text to be associated with
  the transaction and logged in the history file with this
  delete transaction.

1.4  –  Dg crcf

  Click on the Remove Contents button to indicate that CMS
  should remove generation members from the specified
  classes prior to deleting the classes.