HR's do normalization or standardize performance scores by demographics like, Grade, Designation, Location to check for any rater bias. These are then used to drive compensation bands and make decisions requiring differentiated indices. 

HR can do Normalization from the Home screen (Performance -> Normalization).

HR will be able to view the idealized bell curve set at the start of the year and the superimposed actual bell curve based on the outcome of the actual outcome of the performance appraisal process,

HR when viewing this data will be able to choose the demographics as required by selecting from the list available in View Summary by

Few of the options available listed in the drop down menu are  

For employees who are in the Approve Feedback and Recommendation Stage normalization can be done. 

HR can choose from the available options in the drop down box to change the Grade of an employee. 

It is also possible to Export the details to Excel as this. And also Approve or Reject the recommendation on finalizing the Grade. 

PS: Synergita implementation for your Organization may vary from how the features are described here. The screen shots given here may also be different from what you see in your system. Please talk to the concerned person in the Organization for any specific queries.