Click Select on the vertical toolbar.
Select Pipelines in the Locate Filter.
Select a pipeline from the Graphic View or the Workspace Explorer.
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 pipeline 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 pipeline 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.