If you make a split and leave it in the same yard, of course the field bees will return to the old stand. You need to include many young bees.
Make the split using 1 frame of honey,2 frames of sealed brood, 1 frame of unsealed brood, and a pollen frame.
Shake all the bees back into parent hive.
Place excluder on parent hive
Place body with nuc on excluder
Cover overnight. Next day remove nuc to new stand.
The open brood will attract many young bees to care for it. These won't fly back to the parent hive.