Can I open long and short position in eth at same time in delta exchange, or they will close my short position when I create new buy ?
In the same subaccount, positions net.
If you open a buy while holding a short on the same ETH contract, your short will be reduced, then closed, and if you keep buying, reversed to a long.
How it works (same subaccount, same contract)
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short 10 ETH → buy 4 ⇒ position becomes short 6
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short 10 ETH → buy 10 ⇒ position becomes flat (0)
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short 10 ETH → buy 15 ⇒ position becomes long 5
If you want long and short at the same time then use separate subaccounts.
Positions, margin, funding, and liquidation are independent per subaccount, so they won’t net off.