Dynamic sections in footnotes for classical works?

Philo De opificio mundi 23.69, in Loeb Classical Library [LCL] 226 (Cambridge, MA: Harvard University Press; London: William Heinemann, 1929), 54.

I have everything I need except the field after “mundi” and before “, in”. If I use the “section” field, I can only use one reference per book or it throws off the bibliography with all kinds of multiples. Is there a way to create a second dynamic field so that I can cite the section of classical works?