Not a problem, but culd be a new feature if You can develope some function to make easy to assign related articles.
 
For example:
I have 50 articles. 10 of them not in the same article category, but I wanna link them each other. Now I need to manually open the related article link one by one and search for all the other 9 articles. This is 10*9 = 90 Article serach by name.
 
If You colud make a "tagging" I just need to type one tag when publishing the article (or select from the existing ones). This way we do not need to search for later articles, and open, assign them to the new one when publishing a new one.
 
OK, as I sad its not a bug or main functionality! Just please save it to the developement requests... :)