I train many experienced HCSS HeavyBid and find more often than not that they use the incorrect screen to change material prices throughout the bid. This video shows a better solution. Even if you are using Quote Folders the Change Material screen still has a critical function. Understanding the interface between the System Wide Material Codebook, Local Material Codebook and Change Material screens is important to understand. If these YouTube videos help you consider on-site training or coaching services to make your estimating department more efficient. 

HERE is the Youtube link.