I would like to know the most safe procedure to split my ETH. I have one ETH account with 15 ETH end one ETC account with 7 ETC. After the fork both wallets had 10 ETH / ETC. I transfer 3 ETH to Poloniex, after that, both account had 7 ETH/ETC. Now after adding some ETH to my wallet my situation is 7 ETC and 15 ETH. If I transfer all ETH to Poloniex what happen? I have to do something else?

Thanks.