We have added Related item columns to add related items in document library in SharePoint 2013 Online (Office 365 E3 version).

Now, want to implement View of Related Item for each item in the document library.

Any approach, information, code about this would be greatly appreciated. Thanks!

Hi Shailendra,

Per my understanding, you might want to display all the related items of an item in the library list view page.

As there is no such OOTB feature can meet your requirement, a suggestion is that you can customize the list view page by applying some custom JavaScript to modify the HTML source code of the page.

About how to modify the HTML source code of a page using JavaScript:

http://www.w3schools.com/js/js_htmldom_html.asp

http://njarb.com/2011/06/update-html-content-using-javascript/

About how to get the information of the related items, REST API with JavaScript would be a good option for you to access the properties of related items.

More information about REST API:

https://msdn.microsoft.com/en-us/library/office/jj164022.aspx

https://msdn.microsoft.com/en-us/magazine/Dn198245.aspx

Thanks 

Patrick Liang