This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
I got promoted to section manager last month.
I'm glad I was able to become a section chief, but my pay has actually decreased because I don't get paid for overtime.
My section manager is kind of annoying. He is always trying to impress the other workers.