[Koha] some problems

Dear Joshua, Koha users, I have the following problems. Can you please help me out? 1. I had uploaded some Marc records from library of Congress into the Koha reservoir and then tried using the addbiblio option to add into the biblioframework that we have created for our library. But while adding the record, it adds to the default framework. Can anyone let me know how to add it to the biblioframework other than the default one? 2. In our library we assign a unique number to each book which is called accession number. Which field in Koha corresponds to the accession number. 3. What is the difference between biblioitem number and biblionumber? Thanks and regards, --trupti