Click Select on the vertical toolbar.
Select Pipe Features in the Locate Filter.
Select a feature from the Graphic View or the Workspace Explorer.
You cannot select a branch feature or an end feature to disconnect.
Click Tools > Utilities > Disconnect.
The software disconnects the selection, and prompts you to view the disconnection log.
Click Yes to view the log.
A log file displays the disconnection details.
The software disconnects the feature from the rest of the network, and deletes any mating parts or transitions at the boundary connections. The software also removes the relationships between the feature and the rest of the network.
Press CTRL+Z, or click Edit > Undo Disconnect. You can also use Undo Disconnect on the main ribbon bar.