Hello,
I don't know an answer to your question. I am writing with a suggestion.
Withdrawing early from a Roth IRA can involve a 10% tax penalty on the amount withdrawn.
If you expect to need the money before 5 years, you may be better off not using a Roth IRA.
For Roth IRA details you can refer to IRS Publication 590b
https://www.irs.gov/publications/p590b
The section on Roth IRAs begins a little above half way down the document.
Additionally, IRS Publication 590b describes the order the money in an account is considered to be withdrawn.
