Export a Document's Styles as a Style Sheet
If, after defining styles in one page, you decide that you want to use the same styles in another page, you could either copy and paste the style definitions from one page to another, or you can export the styles as a style sheet which can then be linked into both pages. Use the File | Export Styles to Style Sheet... menu item to do this. When you click on this, you will be prompted for a file name to save the style sheet as. Click on OK to save the style sheet. You should note that this does not automatically remove the style definitions from the current page.