BH help

Can anyone tell me what's the best way to transfer the BGS from me main to other account, both account can enter BH high crater. I have logon 2 account into world 18, and try to get them as the same target.... I have tried 2 hours but they never in the same target, I enter BH with 2 accounts in the sametime... Someone know how to get 2 of my account as the same target?