(ddean, it appears you make all the plugins that interest me, I congratulate you!)
So I have a multi site WP instllation.
My main site is http://www.firstdomain.com
I then set up other blogs. One of which is called http://www.firstdomain.com/mynewsite
I mapped the domain so this new site is now http://www.mynewsite.com
I now want to make a new site that is http://www.mynewsite.com/newyork
I'm assuming this is the plugin to help me to do this, only I'm not sure how to do it.
I have gone to the Network control panel and it says I have one network http://www.myfirstdomain.com and this network has 10 blogs (which all makes sense) but how do I make http://www.mynewsite.com my new network?