Distributions from your TSP are not permitted to be used to satisfy RMDs for any other account. They only are permitted to satisfy the RMD of the TSP. If you intended part of the distribution from the TSP to satisfy an RMD for some other account, it did not and you likely have failed to satisfy the RMD for that other account and you'll need to inform TurboTax of that fact so that TurboTax can prepare Form 5329 Part IX to report the excess accumulation in that other account.
I have no idea what you mean by "2. Additional RMD for the rollover." your RMD for the TSP was required to have been completed before the remainder of the account was rolled over, so perhaps the previous distribution that you received from the TSP did not complete your TSP RMD and your TSP RMD needed to be completed before the remainder of the TSP was permitted to be rolled over.
The code-G From 1099-R is required to be entered. For a nontaxable direct rollover the amount in box 2a should be $0, making the distribution nontaxable.
