I'm creating an outline for my novel and come across a problem. I have my main plot planned out, and my subplot as well. The problem I have is, the subplot doesn't effect the main plot in my first book, it isn't until the second book that the subplot has an effect on what the characters do. At the start of the novel, a disaster happens and from that point on it splits into the main plot, and the subplots. I want to explore all sides of the problem that the disaster presents. The question I'm getting at is, is it okay for my subplot, not to touch or have any indirect/direct interaction with my main plot? The characters of the subplot have no interaction with the main characters. Again, the subplot doesn't take effect until the second novel. Don't worry at the end of the first, I tie up the loose ends to the subplots, so the reader isn't left in the dark as to what happens.