For each distribution equipment type, there is an Edit Multiple command that is used to query or edit multiple distribution equipment of that type.
For instance, to edit or query multiple panels, go to
Ribbon: DM Electrical->Distribution Equipment-> 
Edit Multiple Panels
Pulldown Menu: DM Electrical->Distribution Equipment->Edit Multiple->Panels
You can select multiple distribution equipment in the list using the SHIFT or CTRL keys.
Select one or more distribution equipment and press the OK button.
Select from Drawing: Press this button to select one or more distribution equipment on the drawing. The dialog box will close and you will be prompted to select equipment.
Select objects:
The corresponding distribution equipment dialog box will be opened for the selected equipment. You can then view the equipment and make changes as necessary.