If there is 400000 OI quantity and 400000 traded quantity already, will our order will not get executed or if we place lower sell price or higher buy price order, will our order get executed?

:), Nishant if you have a bunch of related questions, try asking them all together.

If the OI and Traded is 4lks, your order will get executed or not will demand on the market liquidity after you place the order. But if there are trading volumes like what you have mentioned, you should be able to get a fill.