Mass updating supplying site - WRF3

Dear Retail Gurus,

I have a requirement to do mass update of WRF3 table (reference is T.Code WB30, we are using the transaction to update MC/Site in WRF6 table). Like this do we can any transaction code to update WRF3? Can any one advise me on the transaction code to update WRF3?

Thanks in advance.