Relating Parent Record to Child Records Across Applications

So... this issue has confused me after some serious blueprinting of options and limitations in Quickbase. I had setup another conversation and just posted much more detail on the issue:https://community.quickbase.com/quickbase/topics/using-formulas-actions-or-other-means-to-auto-relat...

I created diagrams (see comments in the other conversation) of each scenario I could think of which might get me closer to the goal but without adding significant workload/data/relationship management.