You cannot design KRAs in isolation for a few particular designations. First, you have to design the measures for the departments, and the individual KRAs need to flow from the department's measures of performance. Secondly, as an HR Manager, it is not your duty to design the KRAs. It is the duty of the HOD of the department. As an HR professional, you may assist the HOD or facilitate in designing the KRAs. It is a mistaken view of HR professionals to think that since they are the process owner of PMS, it is not their job to design KRAs.
Earlier, I have given a comprehensive reply to a similar query. You may go through the following link:
https://www.citehr.com/526357-kpi-kr...-download.html
Thanks,
Dinesh Divekar