This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)

DefaultDuplicateCellStyle

DefaultDuplicateCellStyle
is a notebook option which specifies the default style to use for cells created by automatic duplication of other cells in the notebook.
Create a document in which "Output" cells are duplicated as "MyDuplicate" cells:
In[1]:=
Click for copyable input
Position the insertion point at the end of an "Output" cell's contents:
When you type something in the cell, Mathematica makes a new copy in "MyDuplicate" style:
New in 3