The Related Content Tab
Related Content allows you to list content related to the current content item.
Note: Related Content is a System content object type. It must first be added to the content item as a content object in order to be displayed as Related Content. Visit the Content Objects page for information about adding content objects to your pages.
When you click the Related Content tab, you will see a list of related content. If you have not added related content, the list will be empty. Click Add Related Content to see these fields:
Search for Content: In the search bar, you can enter keywords to content you would like to list. Clicking search will display the results below.
Add Related Content: This table will appear only after performing a search using the search field above. When the results are listed, you can add related content by clicking an item's associated plus button 
. To remove related content, click the item's associated delete button 
.