Define a hierarchy and tag those three items to a parent node and then select the parent node!
There is a round about solution.... create a subset for that list and define a top level item. Then publish the grid view to the dashboard. Call that subset as page selector in a module and publish that module to dashboard. Restrict the page filter to only top level item. Now you are set. users have to select the list items in the grid view and automatically the module will refresh with required data.