[Koha] Migrating from SageBrush Athena to Koha

We want to migrate from SageBrush corp. Athena LMS to Koha, but we need to migrate our borrower, circulation and cataloging data. We tried bulkmarcdataimport.pl to import our MARC data that we export from Athena but items are not imported. Is there anyone who has experience in migration from Athena to Koha?