I need to set up several stores, all selling t-shirts that I make, with each store selling shirts with a different specific subject/theme. I'm currently selling one specific subject/theme, so I want to set up that store first. Let's call it "Store B". When I start offering other subjects, I want to then set up a store for general subjects to be the master store for managing all of my stores. Let's call it "Store A". Do I need to set up Store A as the master store first, then set up Store B through Store A's admin panel, or can I set up Store B first, by itself; then when I set up Store A later, "attach" Store B to Store A?
Thank you