How to set default world as spawn?

[InspxctElement]

So in my server, we're building a cruise ship. We've built it on a grass/flat world and I want to move it to a water world to finish it up. So I did "import world" and all that with the water world. But when I spawn, I have to do /world ul_waterworld in order to get to the world. Is there any way to make the default spawn world a particular one? Deleting the spawn world doesn't work. 

[pyunbiwi]

Yep. This is possible. What you’ll want to do in order to set the default spawn world is install a plugin called Multiverse. Then enter your server and execute the following commands /mv conf firstspawnoverride true and /mv conf firstspawnworld {world name}.

[InspectElxment]

Thanks!