The Edit Conduit Branch command is used to edit a run of connected conduits. All of the sections of conduit that are connected to the section you select will be modified.
To edit all of the conduits in a connected branch, go to
Ribbon: DM Electrical->3D-BIM-> 
Edit Conduit Branch
Pulldown Menu: DM Electrical->Conduits->Edit Conduit Branch
You will be prompted to select a single conduit.
Select conduit in branch 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.