If i buy 100 shares of rel two times using two cover orders can i execute two sell orders at one click by selling two orders at one click

No, you will have to exit both the orders individually.

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No you cannot.
But you can have same stop loss values set to them. So in case of stop loss hits both will execute at same price. (You can also move the stop loss values into profit zones, below CMP, I dont know whether this is functional now. I have been doing like that some time back in Z5)
Otherwise you need to exit cover order manually one by one .