From the Administrator screen, select Content > Article Manager. Joomla displays the Article Manager screen.
Article Manager Screen
Click the checkbox for the article you want to copy and then click Copy. Joomla displays the Copy Articles screen.
Copy Articles Screen
From the Copy to Section/Category list, select the section/category to which you want to copy the article and then click Save. Joomla displays a message stating that it copied the article to the selected section.