[Koha] [koha]Convert from excel to marc

hello everybody, i'm new koha library manager,i need some help about that. i spend a month to install it at our server,a litter long, i'm not very good at it . if i say some strange things ,just forget it. could somebody tell me how to convert our data from excel to marc, i don't know how to make it,and how it match with each other, if you have some suggestion,could you give it to me ? think you very much! 2010-10-21