Shop is already set. All categories are already added. I have the root password for the server, database if needed.
I have RO CSVI Pro installed, with an addon for CustomFieldsForAll which I would prefer to use.
Must have done this before
Must upload all values for all custom fields in it's appropriate fields
Must NOT create duplicates for any custom field values (i.e. if one item has field value 3 for Size, next import will use this, not create a new reference - this is crucial)
Example file attached.