Add custom map to server as alternate dimension?

Im sure it's possible but im having trouble making it work. Trying to install a custom map from the website as an alternate dimension that could be accessed through /tpx. When creating a folder in the world folder with a name such as DIM10 and pasting the contents of the custom map though, /tpx 10 just generates a new world/mystcraft folder.

I'm not sure which plugin you are using for your server, but if anything I would recommend switching to a new world creation plugin.
http://dev.bukkit.org/bukkit-plugins/multiverse-core/
All you have to do for generating a world is type
/mv create [Name] normal
Then it generates the world into your main server folder. When you open the folder of the new world delete all the files inside it, and replace them with new ones, then restart your server. Then type /mv tp [world name] or type /mv list to teleport to the world you created.

I'm not sure which plugin you are using for your server, but if anything I would recommend switching to a new world creation plugin.
http://dev.bukkit.org/bukkit-plugins/multiverse-core/
All you have to do for generating a world is type
/mv create [Name] normal
Then it generates the world into your main server folder. When you open the folder of the new world delete all the files inside it, and replace them with new ones, then restart your server. Then type /mv tp [world name] or type /mv list to teleport to the world you created.

Will try that now, report back if it works in a few!