Is there anyway to delete chunks beyond some point like everything past x20000 z20000 and x-20000 z-20000 gets deleted. Is there any plugin for this?
Get WorldEdit if you have not already, then go stand in the chunk you need deleted and use the command //chunk command. This will select the entire chunk, from the top of the world to the bottom. then use the //cut command. If for some reason you need to undo this, do //undo