Updating Estimated Costs to Complete

Has anyone developed a smooth process of working with Project Managers to analyze and update Estimated Costs to Complete?   We provide them reports with Costs, Estimates, Change Orders and Committed Costs and we input any suggested changes through the change order task.    But getting information into a workable excel format isn't as easy as it could be.  And using a PDF isn't ideal as they can't interactively see the effect of the changes they are proposing.  Thus, it is prone to errors and misstatements.   Thanks