You can use the Folder Manager to export the dashboard definition (and
any pivot tables) to XML files. It's pretty easy to make simple
changes to those files. A pivot table definition includes something
like this:
cubeName="HoleFoods"
Just change that to the name of your subject area.
You can then reimport the XML files. Or, better yet, copy & paste
their contents into a dashboard container class (like the
HoleFoods.DashboardsEtc sample). (Just leave out the xml declaration,
the first line in the XML file.)
It's quite worthwhile to put the dashboards & pivots in these
container classes. When you compile the container class, that
overwrites the definitions of all the items defined in the class.
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You can also view & copy the pivot table & dashboard definitions in
Studio. They're shown in the Workspace window, in the Other folder.