Spread Trading 2 futures

New to Indian market so pardon my ignorance
Seeking help on understanding margin / product etc
Any brokers or a experienced trader who are familiar with these things please contact
1) Calendar Spread trading say Nifty to Nifty or Bank Nifty to Bank NIfty
Does this work after paying all the taxes!
DO brokers give margin offset?
Can the spread be traded as a single order? so no legging risk

2) Intra market spread like NIfty to BankNIfty ( same questions as above)
3) Cash to Futures spread ( called arbitrage generally but in actual it is nothing but Basis trade) ( same questions as above = specially this will have stock held for long time until futures expiry can one borrow get leverage for that component! )
Thanks in advance for all the help

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