Use this window to copy entire classes.
Define the new class name that is used for the copy of the active class. You can select a package in the pulldown menu "Destination Package" into which the class is copied. You can also select a destination class. The copied class is then an inner class of the selected class. You can finally enter the new (inner) class name.
Be carefully that there is no class using the same name or the methods of both classes are mixed.