To Bring a Particle View Setup into a Different Scene
In Particle View, highlight the events containing the particles you want to merge with a different scene. For example, to designate only a particular flow, you might highlight its global event, and then choose Select menu Select Downstreams.
Choose Select menu Save Selected, and use the file dialog to specify a file to save.
Note: Any scene objects on which Particle Flow depends are also saved. For instance, if a Shape Instance operator in one of the highlighted events refers to a certain object, that object is saved along with the designated events.
Open or create the scene with which the saved Particle Flow setup will be combined, and then use Merge to merge the file from step 2.