I am sorry, BookLibrary hasn't simply algorithm add new fields. For add new field need check many files.
Below small book library customization manual.
You may do that self, or you may hire us for that.
ours component have Open source,
That file responsibel for import/export. For check what format we sopport for import, please do export first.
it have two parts admin and frontend.
in admin you will see two files:
admin.booklibrary.html.php - responsible for show data
admin.booklibrary.php - responsible for prepare data
exactly for frontend
booklibrary.html.php - responsible for show data
booklibrary.php - responsible for prepare data
Also all fields what you leave empty - will not show at frontend
All connection between what user press in Browser - do wit help TASK variable.
also if you wish all Joomla class methods work. E.g when you create new Book
mosbooklibrary class. you need also edit file
and add to class definition all new fields what you added to database
If you give full details what exactly you wish, we will self create that for