How to prevent releationship creation on Fieldset when field _inside_ the Fieldset is empty

I've found an example from "How do I make a relationship optional?" posted by @TheCrazyBob which uses

->saveRelationshipsUsing($record,$state)

->saveRelationshipsUsing($record,$state)

however in this case it's making the condition on some other field on the main form whereas I want to only create this relationship if a field inside the FieldSet has been filled.
At the moment

$record

$record

only contains the parent record's fields. Is there a way I can do this based on the Form input instead please?

How to prevent releationship creation on Fieldset when field _inside_ the Fieldset is empty

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How to prevent releationship creation on Fieldset when field _inside_ the Fieldset is empty

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