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Set save_as to enable a “save as” feature on admin change forms.
Normally, objects have three save options: “Save”, “Save and continue
editing” and “Save and add another”. If save_as is True, “Save and add
another” will be replaced by a “Save as” button.“Save as” means the object will be saved as a new object (with a new
ID), rather than the old object.By default, save_as is set to False.
Source:stackexchange.com