I was transferred to the Chiba branch office.
I got invited to the takoyaki party for the agents of FBI field office in Tokyo.
I sneezed in front of the Kyoto branch of Television Osaka, Inc.
The support bureau is the group that supports a business. It is the branch office.
If it helps, this word has the same meaning as 支店 which you will also be learning in this level.
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.