The text violates English word-order rules. If you have a copy of the famous book English Grammar in Use by Murphy, consult unit 109. Subject-verb-object(s)-other information. Dave (subject) went over (verb) plans to reduce staff (direct object) with his partner (other information) Good luck with your English study!

Ignore the AI-generated text by the other poster. It is wrong. (AI isn’t actually intelligent; it copies and pastes words to create plausible text. The text must be reviewed and corrected by a knowledgeable person.)

The sentence is incorrect, making its meaning unclear. To capture what I guess to be the correct meaning, a good sentence would be: David agreed with his partner’s plans to reduce the workforce. Questions of the type ‘Is the following correct?’ are rarely useful by themselves. Statements need to convey the intended meaning. Therefore you need to describe the meaning and ask for ways to communicate that in English. Grammatical correctness is neither necessary nor sufficient to convey meaning accurately. It’s a good thing to strive for but also arbitrary and not really central to communication.

I don't think the sentence is wrong myself, but it would be a bit clearer to say: David went along with his partner regarding his plan to reduce the workforce. or even better: David went along with his partner's plan to reduce the workforce.

Chris has a good answer. In short, WENT ALONG and WENT OVER, are conflicting in your sentence. WENT ALONG = agreed with, or literally went with WENT OVER = reviewed The order in which these appear in the original sentence is confused. You could say something like: Along with his partner, David went over the plans to reduce the workforce.