[Roy Dennis]

I think it will only work right if they are all the same Disc id and you only import the ones with the same disc id for each batch, which if they are true disc ids there would only be about 10-20 tracks per disc id.

If they are all different disc Ids after the first track that the id changes it will probably reset the brand column unless the brand appears in the file name in which case you would have to have brand selected in the define field order.

If you are importing them with mixed disc ids then you need to set the define field order for disc id and track to ignore (sometimes 2 Ignores if there is a track # present) and then manually enter a Disk ID or let it set it's own which would be in the form of xyz123.
Then select the Single option import of 99 tracks per disc id rather than the Batch button as it may revert back to unknown after the first batch of 99.

If you don't understand what I'm trying to explain post back exactly an example file name as it appears and your field order settings, I may be able to suggest a setting that will work for you.