Progress Calculations

I am using RTC for a project in non-Agile mode.  I am using hours to track progress and effort.

I know that the progress calculation in RTC is not a simple summation, but is there any way to get sum the hours?  I have a parent task that has multiple children tasks.  I want the Estimate for the parent task to be a simple summation of the Estimate hours of the children tasks, and the Time Spent for the parent task to be a simple summation of the Time Spent hours of the children tasks. 

RTC perform the calculations correctly in the Progress Field (I.e., maintains the parent-child relationship as I want), but then performs the Progress Calculations that change the values.  I want to turn off the internal Progress calculations and simply accumulate the values.

I end up dumping my plan into Excel and calculating the values manually which is time-consuming.