Disconnecting Items
Select the non-line items you want to disconnect and click Disconnect. The items turn red to indicate that they are no longer connected. After disconnecting, you can then drag each item to where you want it to be connected.
Note: If you select a bus and choose Disconnect, the items connected to it turn red, not the bus itself.
Because Disconnect actually deletes selected line items (cables, transmission lines, and busways) from the database, move line-items by double-clicking and filling out new connectivity information in the database dialog box. This method also works for non-line items.