About Branching to Another Pipeline
Using the 
Branch button, you can create a branch in the piping system from one of the following:
Branch button, you can create a branch in the piping system from one of the following:• Datum point or entry port to a pipeline
• Pipe end of another pipeline
• Branch point on a pipe centerline to another pipeline
When a branch is attached to a pipeline, the system automatically creates cuts in the solids that meet at the branch point. The point of connection is located on a pipe centerline.
You can create a branch starting from the end of an unconnected segment or from a break point or entry port. However, you can not branch to a pipeline in another assembly or to another segment of the same pipeline. (This functionality is not available at all for flexible pipes.)