Consolidation of SSIS packages

Hi
I am using SQL2K5 I have SSIS Package1 and Configfile1 SSIS Package2 and Configfile2 and so on... Currently i am running it manually one by one on SMS using integration services. I have assigned to automate the process or consolidate into a single package. I can automate it using execute package tasks without config file. there is no option in the execute package task to point to the right config file. Any pointers on this would be appreciated.

You can configure each package with its own config file by selecting SSIS tab then Package Configuration. As you said create a master package use execute package tasks to call other packages from file system or server.
Hope this will solve you problem as package configuration is specific to a package.