[Koha] Migrating old data to a new installation of Koha

Hi folks, I have done a clean install of Koha 3.0 on Ubuntu 8.0 and i need to migrate my old data from Koha 2.2.9 but am facing some problems. THe old database has about 74 tables, the new one has 125. When i import data using phpmyadmin, the system terminates at the first table due to primary key differences in the both structures. Can someone advice me the best way i should migrate this data to maintain integrity of the MARC structure flawlessly. Thanks Benson Mugambi SHAREDOC What comes out of you when you are squeezed is what is inside you. - Wayne Dyer