Diploma

Hi Jyoti,
Chances of getting admitted will be less. You already hold necessary qualifications. Without any concrete reasons as to why you want to study a diploma course in HR having already completed your MBA in HR universities won't be interested. Rather, you should get a job and gain some experience if you don't have yet and then apply to a relevant PG or PG Diploma course.

Hi,
Eligibility:
Candidate must be a graduate from a recognized University.
Admission Process
Interested candidates can apply directly to the college.
https://www.shiksha.com/mba/course/post-graduate-diploma-in-retail-management-symbiosis-centre-for-distance-learning-delhi-swami-nagar-172724

Yes, you can surely get admission to NIP.