Sorry for confusing you,
I just thought you are trying to insert data using Console.
You have a few options how to setup relations between data objects:
- manually, using Backendless Console
- using api Set/Add relations
- using custom business logic, afterCreate EventHandler, here is doc for JS https://backendless.com/docs/bl-js/bl_eventhandlers_getting_started_js.html
Regards, Vlad