Setting up a SQL Agent job to run the master SSIS package may help. The job step configuration for an SSIS package includes a "Configurations" tab for defining which config file(s) to use.
Forum Etiquette: How to post data/code on a forum to get the best helpMake sure that you include code in the appropriate IFCode tags, e.g. <your code here>. You can find the IFCode tags under the INSERT options when you are writing a post.