Non PINS Demat Account query for Non US based NRI

Thanks @sdparasnis and @sbhadti for your response. How to funds this(PINS NRO) account? Can we transfer money (Rs to Rs) from earlier bank account to this account in INR or they money has to be from abroad (e.g.- Doller/Pouds to Rs)?

One more question (based on your experience) - When do we need NRI NON PINS account? What are the benefits of having this account?