One of the best statements on position sizing. This explains why some retail traders fail in futures and options, where, though, the investment appears small, risk is really based on large quantities
Secondary mkt instruments are very different from Mutual funds and I think you're checking in wrong portal.
AFAIK, NCDs/Bonds/Tax free bonds are traded in the N series, that is N1 to N9 and NA to NZ.
NSE > NORMAL > N1
This is for all brokers, so in your case you should check Nest/kite instead.