Would anybody know if it is possible to define the MARC Framework when importing bibliographic records?

There is no way with bulkmarcimport.pl script to define framework for imported biblio records. But you can modify this script to do it: 1. Specifically for your need. 2. Add a parameter to this script and modify its code: AddBiblio and ModBiblio Koha API calls.

I read on mailing list that the only way is to change the framework names *after* the importation, changing the biblio.frameworkcode. But would anybody know how is it possible to change it in ca 6000 records?

If you want to modify ALL imported records, just do this SQL command: UPDATE biblio SET frameworkcode='MYCODE'; -- Frédéric DEMIANS http://www.tamil.fr/u/fdemians.html