How to fill "department" for the author actually without department? I found many journals require the department information for all authors during submitting manuscript. However, some authors indeed don't have department information. How can I fill this form in this condition?
I don't see anything wrong with "N/A". Don't overthink this --- odds are that no one with a say on the acceptance of your paper (editor, reviewers, editor in chief) will ever look at this field. They are only there for the convenience of the journal staff, as far as I understand.