Deply aggregations

Hi,I'm using SQL server 2008 R2.Monthly a job creates new 'month' partitions. So this partitions are not in my BIDS project.Now I have created some 'usage based aggregations', and want to deloy them.My problem:When I deploy them with 'Retain partitions' the new aggregations are not deployedWhen I deploy them without 'Retain partitions' checked, my job-create partitions are gone.What is the best way to deploy the Aggregations, without losing my partitions?Thanks for any suggestions.