CPA set aside 1k from 2017 refunds for quarterly pymts. Using TurboTax this yr & IRS has this? I'd just have to file a credit for it this yr? Where & how do I do this?

CPA put aside 1k from my refund last year. He said this would be there to save on quarterly payments. I am using TurboTax this year and he said he does not have it, it is at the IRS? I asked how to utilize that money for the money I owe this year and he said I have to file a credit for it and that was that. How do I go about doing this and making sure that 1k is accounted for. 

Thank you