NeroAPITest problem

Hi everyone,
I need to create an application that burns some files of my hd on a cd or dvd.
This cd or dvd must contain 3 directories named “image”, “file” and “other” in which the program must add my files.
NeroAPITest.cpp’s project burns all the directory and the files I pass it, but
it doesn’t allow to create “root” direrctories on cd or dvd.
How can I do ?
I read in last post that i must create several instances of NERO_ISO_ITEM structure, but I don’t know how modify NeroAPITest.cpp in order to do it.
I read also several post related to NeroCmd example of SDK, but nothing related to NeroAPITest example.
Thanks a lot.
It is very important for my job.