Import Invoice data to CRM 2011 from CRM 4.0

Hi everyone,

I just started to use CRM 2011 online. I need import some open invocie data from CRM 4.0. I have a problem with the "invoice products", I do not know how to import these data, and the Total amount and detail amount (the fields under Total). I could export these data from CRM 4.0, but it can not map tp CRM 2011 when I used Import.

Anyone can help please?

Thanks,

Cindy