A "G" is a direct rollover.
You will enter the 1099R as follows:
To enter pension and annuity Payments (1099-R)
• Click on Federal Taxes
• Click on Wages and Income
• Click on I'll choose what I work on (if shown)
• Scroll down to Retirement Plans and Social Security
• On IRA, 401(k), Pension Plan Withdrawals (1099-R), click the start or update button
Due to having after tax funds in the IRA, you need to track the basis so when you do start taking money out only a percentage is taxable income to you.