I would like to import a CSV-file through the import/export module, to a list in my datalist, but how do I set up the import/export to have datalists as a destination?
You need to code your own import/export activity in order to achieve that since there are no standard activities for this purpose.There's a section in this document that explains how to do that: http://engage.dynamicweb-cms.com/Admin/Public/Download.aspx?File=Files%2fFiler%2fDocumentation%2fDevelopment%2feCommerce%2f(en-US)+eCommerce+Extensibility+API%2c++Dynamicweb+eCommerce.pdf
