I use to take everything I created an inserted it into my world/universe/set of dimensions/thing. At first, this had the benefit of expanding the universe in an interesting way. it felt like I was actually creating something epic like a world instead of a scenario. as time went on, I found this process more limiting. Everything I made now had to fit neatly inside this world I created. I take special pride in making things that don't fit into my world, or any world for that matter. An odd thing for someone who hosts a fan RP to say, I know. 

But it was cool for a time. Not really for me anymore.