The Copy Equipment in Database command is used to copy equipment that is in the database but not on a drawing. To copy equipment on the drawing, use the standard CAD COPY command.
To copy equipment in the database, go to
Ribbon: DM Electrical->Devices-> 
Copy Equipment in Database
Pulldown Menu: DM Electrical->Equipment->Copy Equipment in Database
Copy Equipment Dialog Box
Group: A list of the equipment groups in the project. The equipment listed in the Equipment list are all part of the selected group. See the Equipment Project Groups section for more information.
Equipment: Select the equipment to copy. The Edit button located below the list can be used to edit the list of Equipment Callouts.
New Equipment Callout: The callout of the equipment that will be created. The default will be the same as the callout of the equipment that is being copied from.
Copy: Press this button to copy the selected equipment.
Copy and Edit: Press this button to copy the selected equipment and immediately start editing it. The Edit Equipment dialog box will open with the newly created equipment connection active. See the Query or Edit Multiple Equipment command for more information about editing the equipment.