Usually you do not need detailed data in the dashboard. For the dashboard you need typically only few dimension. During the execution of the script in your various detailed applications you may produce an aggregated table - in line with the requirements of the dashboard - and store into a separate qvd. All these qvd's then will be read by the dashboard.
edit: Posting crossed with Jagan's reply. You can make a binary load only with one file, not with multiples.