Creating an element in a library uses the same wizards and dialogs as when you create an element in a report design. After you add an element to a library, you make changes to it in the same way as you do in a report design.
Open or create a library.
In the data explorer, create any required data sources and data sets.
To add a style, in the outline view, expand Themes.
Right-click defaultTheme, then choose New Style.
To add a theme, in the outline view, right-click Themes, and choose New Theme.
To add a report item, drag an item from the palette to Report Items in the outline view.
The item appears both in Report Items and in the layout editor.