Just added the extra bit of code.... Went to all the sub categories and deleted the new field box and the one in the main category.. Saved the work and then entered a new field type in just the main category and checked the save to children option....
All the subs received the new box , updated and are only showing the one box now.
BUT after adding a product the checked boxes that worked fine in the add process are still showing up blank and greyed out in the product page..