The Change Linked Database Record command is used to change which distribution equipment or feeder is represented by a graphic on the drawing. This can be useful when copying a block on the one-line diagram, as the copy will not have an equipment linked to it.
To change a database record displayed on the one-line diagram, go to
Ribbon: DM Electrical->One-Line Diagram-> 
Change Linked Database Record
Pulldown Menu: DM Electrical->One-Line Diagram->Change Linked Database Record
You will be prompted to select a distribution equipment or feeder.
Select distribution equipment or feeder to link to a new database record:
If you select a distribution equipment, the Change One-Line Diagram Item dialog box will appear. Select a distribution equipment from the list and press the OK button.