|How do I import multiple dashboard files?
You can import multiple dashboards through the use of .ado files.
An .adb file only contains one dashboard, a .ado file would contain the contents of a whole dockable.
Exporting all dashboard files is possible. Instead of exporting the .adb files, you need to export the whole dockable. Go to View --> Dockable Manager (refer to image below):
To get the dockable back in, use File --> Import and select the .ado file (see below).