I would like to change my 100 dollar bills to various bills. (i don't want it all in 100 dollar notes) how do you say this naturally in the bank? 用 英語 (美國) 要怎麼說？

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I’d ask them for specifically what you want.

“I’d like to get smaller bills for this hundred dollar bill. Can I get two twenties, three tens, four fives and ten ones?”

Or what ever variety of bills you want.

If you really don’t care which smaller bills you get, perhaps say:

“I’d like to get smaller bills for this hundred dollar bill. Any variety if bills will be fine.”