Extra team on challenge event?

can i use xtra team on challenge event…im now on stage 10 try to finish but not sure can finish last tier without xtra team …

Extra team adds 1 more team slot,
It similar to roster space, you can buy 5 more spaces in roster and you can buy 1 more team space/slot

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oops i thought i can add one more hero to battle… thx for the info…