Use of custom fields

Hi,

I’m trying to import an XML feed with about 50 fields for each ‘post’. I’d like to load these values into custom fields, but I can’t figure out how to do that.

I tried different plugins for adding custom fields or taxonomies, but none of them show up in the import function.

Is there a way to use custom fields? I read you were working on this a while ago.

Thanks in advance!