@OP I can understand your frustration, anger and fear.
As the previous poster said, you're d@mned if you don't add comments or a rebuttal/disagreement, as this will be construed as the you, the employee agreeing with the Rating and/or negative comments by your Manager. There's the saying, "Silence is acceptance or agreement." Do NOT be silent !
And then you're d@mned if you Do add comments or a rebuttal, because typical Citi Incompetent and Lazy HR will only pass the buck, give you the run around and tell you to speak to your manager, the very person you're complaining about! And then your Manager will use your comments to retaliate against you despite the Bogus Lip Service Citi Policy that retaliation is Not acceptable or permitted !
Unless you do the below, you will Always be d@mned and caught between a rock and a hard place. One of many things Employers dislike is when employees document in writing anything because it could be used against the employer in a lawsuit or the employer can get into trouble with industry and government regulators. Employers also try to dissuade employees from consulting with employee-side Employment Lawyers.
This works 90%+ of the time: You must document and write narratives of every single occurrence, detail, when, on what dates events happened that are incorrect or contradict what your Manager stated in Workday. Fight Fire with Fire. Since Managers are permitted to write reviews and comments in Workday, so too can employees !
Also, in addition to naming your Manager, also include co-workers involved or in collusion, etc..
Then, upload the essays/narratives in Workday and email it to your department's HR Business Partner AND your manager's Manager. Even if your manager's Manager and/or typical Citi HR do Not do anything because Citi HR has a bad reputation amongst employees because they're useless and incompetent, at least you have the details in writing and documented in case you need to protect and defend yourself and/or sue Citi.
There's a saying that "Everyone has a Manager/Boss." I've personally witnessed tyrant "managers" and bullies get subdued and their comeuppance when their own managers and other co-workers are made aware of their Sh!tShow tactics and backstabbing behaviours. Will your documenting the Stealing and other atrocious behaviours move the needle entirely in your favor ? No. But the needle and scale will tilt and move at least a little bit in your favor and advantage.
H3LL if I were you, I would even cc, CEO Jane Fraser herself ! You're already on your Manager's Sh!t List anyway. I don't go down alone, and if I'm being pulled down or out, Fired, I may as well take All the MotherFvckers down with me !
Also, take note that leopard do Not and can Not change their spots. Your Manager's and Co-workers behaviours, personalities, reactions and retaliatory traits will still remain and exist. But at least you have the detailed narratives documented in case you need to protect and defend yourself and/or sue Citi.