Add those fields to the join table. (I hope I am remembering your earlier posts accurately.) You can use a layout based on the join table for your report. To list all parts for a given model, you can either use Go TO Related Records from the Model layout or you can perform a find for all Join records with a specified Model ID to get a list of all parts. You can add fields from both parts and Models to this layout and they will display the correct data from the related record.