“Do you want that all in ones?”
A customer at your part-time job asks you for change for a $20 bill. You want to know if they need 20 one-dollar bills, two ten-dollar bills, four five-dollar bills, or some other combination. You ask this.
Do you want that all in ones?
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(an amount of money) in (a denomination)
Different types of bills (one-dollar bills, 100-dollar bills, etc.) are called "denominations". A very formal way to ask the question above is:
In what denomination would you like your change?
You use the word "in" to express the denomination of an amount of money:
Can I get that in twenties?
Drug dealers in movies always carry briefcases with thousands of dollars in hundred-dollar bills.
ones
In the example above, "ones" means "one-dollar bills". Whenever you're talking about money, holding your wallet, paying a bill, etc. you can just use the word "ones" to refer to one-dollar bills.
For other types of bills, the names are:
fives
tens
twenties
hundreds
I'm not really sure what the denominations of bills in other contries are called.