how do I edit data so that records in primary table exist for all related
records in Access building table relationships?
It sounds like you have it backwards. Normally one would create the "parent"
record first, and then (using a subform, or other techniques) create "child"
records related to it.
That said... the relationships between records depend *on the data in those
records*. Each table should represent a class or "Entities", real-life people,
things, or events. The relationships between these entities exist in the real
world; the tables merely represent those relationships. Therefore it makes
little sense to talk about "edit[ing] data so that records in primary table
exist" as if the table relationships were arbitrary!
What are these tables? What's in them now? What Entities do the tables
represent? What real-life relationships are you trying to model?