Indirect IRA rollover

When entering 1099R  for IRA distribution, there is no question being asked relative to whether any portion of the distribution was an indirect rollover.   I can shift from "step by step"  to "forms" mode within turbotax, then go to the 1040 and do an overide at (4B) but its still not deducting the rollover portion from the taxable amount.  I have even gone into forms and  drilled down into the 1099R  for the company which made the distribution and manually put in "the rolled over amount", but the system is just not doing the subtraction.   Obviously I am doing something wrong, but I cannot see what it is that I've overlooked.   Any thoughts ????