DefaultDuplicateCellStyle

is a notebook option that specifies the default style to use for cells created by automatic duplication of other cells in the notebook.

Details

A typical default setting for DefaultDuplicateCellStyle is "Input".
DefaultDuplicateCellStyle determines the style for new cells created from cells with CellEditDuplicate->True or CellEvaluationDuplicate->True.

Create a document in which "Output" cells are duplicated as "MyDuplicate" cells:

Position the insertion point at the end of an "Output" cell's contents:

When you type something in the cell, the Wolfram System makes a new copy in "MyDuplicate" style:

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