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You can read more about it here: Developers Guide: StylesOne simple answer would be to edit your plugins/stylescombos/styles/default.js file, and comment out the ones you don't want, and add any new ones that you need. I don't think that is a good solution, however, because when you update the CKEditor, you'll have to recreate your work. Also it is sort of a 'hardcoded' solution, and makes it more difficult to use a variety of your external stylesheets.External Styles Definition File method:There may be times when you want to load an external file (for example, if you create a styles dropdown list you want to use on several sites or even pages, and would prefer to paste less code.) To do this, you need to first create your own version of the particular default.js file (found in ckeditor/_source/plugins/stylescombo/styles/default.js). Make a copy of that file, and call it your own name, for example mystylesdropdownlist.js, then modify that file to include (or exclude) whatever items you want on the styles dropdown list. Save it somewhere on your server, and remember the location, for example, let's say you made a folder right off your site's root folder and called that folder "myCKEditorMods", and copy your new mystylesdropdownlist.js file into that new folder.Now, to have the CKEditor widget on your web page find and use that file, you would create the instance of the CKEditor something like this:
<textarea name="editor1">initial content text</textarea>
CKEDITOR.replace( 'editor1' );
//the following is an example of attaching my own CSS stylesheet, "main.css"
CKEDITOR.config.contentsCss = '/css/main.css' ;
CKEDITOR.config.stylesCombo_stylesSet = '/myCKEditorMods/mystylesdropdownlist.js';