[Koha] Field 952$o is blank

Dear all, We have imported 26,000 books from resourcemate into koha 19.05.04 but we have 082$a is filled but 952 $o is blank where it should have picked up the data from 082$a automatically but it didn't. As a result I have to add/ edit 952$o field manually for 26,000 books. is there any way to get the 082$a field into 952$o automatically without any marcedit. As the 26,000 books file was prepared by someone else and that person is no longer working with us and I am not at all good in marc edit. Please help me ASAP In Christ, Nalisha