Hierarchical data storage in MongoDB


I have a hierarchical structure in my Meteor Application (image attached) and I want to store data hierarchically in MongoDB as well. I have followed this link https://docs.mongodb.com/manual/tutorial/model-tree-structures/ and have created my hierarchy, but I do not know how to add data (say 100 documents) to the leaf node in the hierarchy (MOSFET, NPN, PNP) or any other node.

Any help will highly be appreciated.
Thank you.