How to add G sec in watchlist?

I want to buy G sec and then pledge them to use the margin for FNO trading, I am using upstox as my broker, could anyone please help me as to how can I add various G sec in my watchlist and then buy them.

thanks,

Buying and pleading individual gsec is a hassle. I recommend buying mutual funds, liquid/gilt funds (with low expense ratio) and pledge them. This way, you don’t have to bother with managing them.

thank you