Configure Excel Calculation Services with Project Server 2007

Published last week on TechNet: https://technet.microsoft.com/en-us/library/cc770224(TechNet.10).aspx

and if you want to see sample Excel Services reports in an EPM context, check the following:

https://blogs.msdn.com/chrisfie/archive/2008/04/13/new-excel-services-sample-reports-for-project-server.aspx