It should be possible to shrink the OSX partition within OSX's disk utility and then grow the Windows partition within Windows with it's own disk management tool. However, remember to do backups before trying this.
i tried winclone, but i cant create an NTFS on a osx. so i tried to creat a partition on mac and moved to windows to format it, and it didnt work eather.
thing is with NTFS, is that os x can only read and not read/write