Bulk Additions & Updates in SQL 2000/2005

[samindra]

I need to Add & update 100 plus users info daily basis. Right now I am doing one at a time through the vendors GUI interface. I need to do this process with bulk additions & bulk updates. My db environment is SQL Server 2000/2005

Could you please let me know much efficient way to do this process?

Thanks & Regards,
Sam