My 1099-R form has money rolled over to both Traditional and Roth IRA. But my Online Premier account doesn't give a choice to add only part of the money to Roth IRA.

How do I proceed? The question I have to answer in Turbotax online premier is if the whole amount is converted to Roth or not. But only a part of the amount is converted to Roth and rest is converted to traditional IRA.