There's no call forwarding options in iOS 16
I can't find anwhere how to forward calls on an iPhone with iOS 16.
Here shows there is a call forwarding option: https://www.techbout.com/forward-calls-iphone-another-number-14461/
And Apple's own support page says there is too: Set up call forwarding and call waiting on iPhone - Apple Support
And if within the Settings app you search for call forwarding, the search results show there is a call forwarding option, however if you actually tap on the forwarding search results it takes you to the Phone section of Setting. But once there is just isn't any option anywhere to forward a call.