Multinode with link on drop

In BPM when i drop a node from a palette , How can i draw a multinode along with link on right hand side as shown in the image

You could just add the nodes and links that you want in an “ExternalObjectsDropped” diagramEvent listener.

Or if you want a more general solution, you could represent the collection of nodes and links in the Palette using Groups. When dropped you could automatically ungroup them, expanding them in place. Example: