[Koha] PARAMETERS

We have installed Koha 2.2.9 and are trying to set up our parameters such that the Catalogue -> Add Biblio screen will only display the fields/subfields that we use. We have tried to delete those we don't want using Parameters -> Biblio framework (MARC structure) but when we get back to the Add Biblio screen, it still displays all the fields and subfields that we do not want and this is too cumbersome for data entry. Please assist us in this regard. Regards, Douglas