A source is anything in the station that contains an InfoSource.
If you assigned your source to one or more Nodes, when you copy-paste your source in the station, the relations from the InfoSource to the Nodes are deleted, because Niagara doesn't keep them. Therefore you loose your assignments.
In order to counterfeit this, we created a Workbench command called "Paste Source", that keeps the relations. In addition, if you use it between two stations, the command will retrieve the assigned nodes to the source even if handle are different using the node's id.
In order to use it, just copy anything in the station, and then use "Paste Source" instead of the regular "Paste".
