The Edit Multiple Conduit command is used to edit multiple individual conduit sections. The selected conduits do not need to be connected to each other. You do not need to select all of the conduits in a run.
To edit multiple conduits, go to
Ribbon: DM Electrical->3D-BIM-> 
Edit Multiple Conduit
Pulldown Menu: DM Electrical->Conduits->Edit Multiple Conduit
You will be prompted to select the conduits to be edited.
Select conduits to edit:
The Edit Multiple Conduits dialog box will appear.
Edit Multiple Conduits Dialog Box
Changes can be made to the conduits in the same way as when they were inserted. See the Insert Conduit section for more information.