On the Reports tab, select the multi view folder 
in the navigation pane. Optionally, expand the folder and select the category of report (Favorite Reports, My Reports, or Public Reports).
Either:
a Select a single report in the Reports tab content pane to enable the Modify Report button 
in the Reports tab toolbar.
Then click that button to launch the Edit Multi-View Report dialog box. This is functionally the same as for a new multi-view report except that the various fields will be pre-populated.
b Alternatively, click on the report name in the Reports tab content pane to directly launch the Edit Multi-View Report dialog box.
As an alternative to Step 2 above, select a single report in the Reports tab navigation pane to enable the Modify Report button 
in the Reports tab toolbar.
Then click that button to launch the Edit Multi-View Report dialog box.
To modify an existing report, modify the various fields in the Edit tab of the Report Builder as described in Creating a Multi-View Report.
To create a new report based on an existing report, in the Report Name type a new name and then modify the various fields in the Edit tab of the Edit Multi-View Report dialog box as described in Creating a Report.