In my table's advanced settings, I see this option:
Save parent record automatically when a child record is created. Learn more
Learn more doesn't provide any detail about this specific function. I've searched for help with it with no results.
I checked the box on tables with and without a parent and it saved without error or dialog box. Seems strange.
I'm interested in using such a function if it is native, I'm also curious if it would do some sort of checking for duplicates if the creation involves a key field other than the record id.