にしますか

will you choose

→ に
phrase Common #6,008
will you choose Used after an option to ask what someone will choose or decide on. In polite conversation, it can also mean “what would you like?”
JA: 飲み物は何にしますか。
EN: What would you like to drink?

何にしますか?

What will you have?

赤ワインにしますかそれとも白ワインにしますか。

Would you like red wine or white wine?

お飲み物は何にしますか。

What would you like to drink?

シングルになさいますか、ダブルにしますか。

Would you like a single or a double?