1) Firstly before following this tutorial make sure you have followed the instructions for saving a style in order to have a style to duplicate.
2) Choose 'Window' > 'Other Panels' > 'styleManager' to open the Style Manager panel.
3) Select the style you wish to duplicate by single-clicking on it.
4) Enter a name for your new style in the Style Manager panel's input field.
5) Click the Style Manager panel's duplicate button (The icon depicting two overlapping pages).
