Recently I came to a scenario when I had shared folder and wanted to share it with someone new – but not all of it, just one subfolder. Dropbox isn’t yet giving us good solution for this but we can do a little trick here and make it happen.
So the workaround is to create a symbolic link, you can do it either on widows and linux base systems. Go to the terminal and type:
C:UsersDropbox> mklink /J NewFolder SharedFolder/WantToShareSubfolder
For Linux / OS X
user@host:~/Dropbox$ ln -s SharedFolder/WantToShareSubfolder NewFolder
After doing that just share newly created symbolic link with the person and you’re done.