Custom fields

When you're mapping an import or export, you can also add your own fields (if you can't find such fields in "Internal elements"). This is particularly useful in the case of non-standard data that is seldom used. However, if using custom fields, you have to remember that those fields are not automatically mapped in the export. Their names should indicate each bit of data that you want to save there – they can't be the same as the names of the "Internal elements" fields.