IBP Demand Planning Statistical Forecasting - How to select Alpha,Beta,Gama?

Hi,

We are currently on Release 4.0 Support Pack 2 and attempting to get the most out of the statistical forecasting tools that are avaialble. Considering that the only outcomes are Linear, Trend or Seasonal generating consistant reliable forecasts appears to be a hit-miss approach. All Alpha, Beta and Gama entries need to be manually entered for IBP to then select the optimum result. Does anyone have a solution that can use historical data to generate an IBP starting point for the number of historical months / A-B-G parameters?

Thanks

John