I'm not really sure if this is a suggestion really. More of a question, but it's about the site.

What is the rule for series that are released in distinct parts because there's a lot of inconsistency?

Like Jojo's Bizarre Adventure is broken into it's subseries(Battle Tendency, Stone Ocean, etc.) and also has a page for the series as a whole.

Then there's like Kaiji that has a page for the whole series and also the 3rd and 4th series being published.(Tobaku Datenroku Kaiji and Tobaku Mokushiroku Kaiji: Kazuya-hen)

And I can't think of any off the top of my head that have pages for the various parts in it and no main page but I remember at least one.

And then some, like Bastard!!, have just the main series page.(At least as I recall it's broken into parts, with the chapter numbering starting over and everything. I could have it confused with something else.)

I kinda feel that having a page for the whole series and its various parts is better, but I wanted to know what the established rules for this is?