How to Use Goodreads Format for Import

I am wondering if I can use the Goodreads Import process to import a csv file which contains only selected number of fields.

Is there a Goodreads import document I can read?

"The new Goodreads Import system is designed to work with files directly exported from Goodreads; we kindly ask that you do not modify the file before uploading, to avoid unexpected results. Likewise, we ask that you do not try to use this for other types of imports by editing your file to match the Goodreads format."
From https://www.librarything.com/topic/374440