The preferred approach to joining two or more discontinuous duct banks is to route from one of the segments along the path.
Alternatively, you can manually reposition the conduits within the duct bank so that the two cross-sections match. Then the two segments can be merged. After ensuring that the cross-sections match up, each conduit run in one duct bank needs to be extended to join its corresponding conduit run in the other duct bank. To achieve this join operation, use the Route command or the Move command.
Without this manual joining, path continuity is not achieved and cables cannot be routed between the two conduit runs.