You have to look at each state’s individual party rules for the answers. I can not find Ohio’s on GP. Someone forwarded me their rules though, and I think they are assigned to the 2nd runner up -Trump. But Kasich would have to exit for that to happen. He doesn’t look like he’s going anyplace soon.
"Brittany Warner, Communications Director for the Ohio Republican Party, told Conservative Review that the delegates remain bound only for the first ballot.
Warner also confirmed that the first ballot binding must be for Kasich, and no one else. Warner said, "what you questioned yesterday[regarding delegates going to Trump] is not correct. As the rules state, the 66 delegates will go to the winner of the Ohio primary (John Kasich).”
Saying that Trump would get the 66 delegates from Ohio if Kasich dropped out was being used as an argument for Kasich’s continuance in the race for the nomination. It was argued that he needed to stay in. That argument is clearly false. Kasich will keep his Ohio delegates and they are bound to him on the first vote. He cannot release them to vote for any other candidate during that round."