Copy field from previous record on a subform

I have a form with a subform
Add a new record on the form and assign a key.
Subform shows a new record with the key.
Click a field on the subform.
Ctl-” does not copy forward from previous record.
I want to use record clone on the subform (which doesn’t work either) so I think if I get this example working I can get the clone copy working
Thanks for taking the time to understand this note.
Bob Pod