To duplicate posts and custom posts in WordPress Bulk Posts Editing Plugin, first of all, you should select your desire posts or custom posts and then click the “Duplicate” button in the “Toolbar”. In the box that appears, enter the desired number of copies and finally click the “Start Duplicate” button.
For more details please read the “How to duplicate multi WordPress posts fast and easy?” article.
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If after reading the articles you still think have unanswered questions or need custom work for your plugin, contact iThemeland Support.