Hello,

You should be able to do this with a little modification of the /etc/nginx/sites-enabled/ghost file.

So assuming you wanted to have the folder called abcd then you could do:

 location /abcd/ {
        root /usr/share/nginx/html/;
        index index.html;
    }

The files would be uploaded to /usr/share/nginx/html/testing/

Keep in mind though, that you can never make anything with ghost with the name abcd as it will just get routed to the new site instead of rendered by ghost.