On your CA PPM environment:
Administration > General Settings > Client Downloads
You can download the XOG client that contains different default files to do XOG read and write actions.
There are default files that will allow you to work with:
departments: department_read.xml and department_write.xml
menus: menus_read.xml and menus_write.xml
OBS structure: obs_read.xml and obs_write.xml
You can edit these files as any other to point to your departments OBS, menus ....
Here some documentation in XOG if needed:
https://communities.ca.com/thread/10046520
https://docops.ca.com/ca-ppm/14-2/en/reference/xml-open-gateway-xog-development
Regards