I really like the idea and main plot I have for my novel series. The only thing is that I can see so many opportunities to write seperate novels set in the same setting, just maybe not 100% directly related to the main story arc. So I was thinking of writting my main novel series but then also writting a seperate collection of novels (or short stories) directly related to the setting/universe of the main storyline but not directly related to the actual plot.
To give an example let me use a hypothetical suggestion. Harry Potter. The main storyline would be of Harry but what if Rowling made a seperate series about an Auror hunting dark wizards and witches? Let's say she named it "The Auror." So the "Harry Potter" series and the "Auror" series wouldn't be directly related by plot but by setting.
There is a lot going on in my plot and the setting is vast in scope, involving many different countries. So do you think it would be a good idea if I made a sort of central "universal setting?" This way, the main novels and storyline would still be the cental focus but also allowing me to branch out for more creativity and novel opportunities. I'm not sure if this has a defined term or anything.
(And I'm not sure if I would want the seperate series to be actual novels or collection of short stories yet. I think the concept of a novel would be better because you can go into far more detail but as for now it's just an idea)