Here's a link to your receiver on the Sony website.
It's a pretty, no, make that very, basic receiver and leaves out any features not absolutely essential to it's mission, which is delivering many inputs to feed one, and only one, set of speakers.
"B" speakers outputs and second zone capabilities are among those niceties that were sacrificed to make that barely entry-level price point.
If you want additional features, you're gonna have to go a few rungs up the model ladder.