I have a question about the storage design wizard in the analysis manager.

We are working with different seasons in our reports and every week we update the data of the seasons in our cubes. But as seasons end, and at some point the data for old seasons doesn't change anymore, I don't think it is necessary to update every season every week (which we now still do now for seasons in, for example, 2004). It's a waste of time. So my question now is. How can I storage the data of previous seasons (and work with them in the report) and still be able to update the current season? Can I use the storage design for this??