[Koha] Where to put Self mark?

Hi, Thanks so much for your previous help. Now I have a different Issue: I am importing data from a old database to Koha. In my old database I have a field called Shelf mark, that corresponds to the location of the books on my library. Now I am trying to move that to Koha, but I am not sure where should I put it. I tried using 952$j Shelving control number, but it does not work. Should I put it on 952$o Koha full call number, or on the $082 Classification number? or is there other place for it? *$082 ** Shelf mark* 254 253:M113 535 535:J651 535 535:R831 Thanks --