[Koha] Bibliographic frameworks

Dear Koha users, I have created a new bibliographic framework, but am unclear as to how I associate this framework with the file of bibliographic records that I wish to import. I am not using the bulk marc import, but am importing through the Web interface. I know that I must be missing something really obvious or else I am misunderstanding how the frameworks function. Is it possible to align my framework with my file? I much appreciate your help. beth