Question regarding margin requirements

I want to enter a current expiry future short and next expiry future long for the same stock, The overall margin showed is 5.4L and final margin is shown as 38k, I recieve 5L as hedge benefit

My question is that, Am I allowed to enter new short/long future positions with the remaining 5L hedge benefit as only 38k is “blocked”. Can I purchase a future whose overall margin is 2.5L and required margin is 2.5L with the remaining 5L margin provided as hedge benefit?

You can use. But if you break hedge leg then margin will increase for remaining leg, so just exit both legs at same time or make sure you have enough margin if one of the leg is closed.