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It is often advisable to purge all existing process costing records from a system before importing process data from csv, as the imported process data only adds or updates what's there.  This is particularly true with process data using thresholds to lookup different processes for different holes sizes (for example).

 

Select one or multiple Systems under the Cutting Systems tab, then press Purge Process Data.  All process data records across all grades and thicknesses for this system will be queued for deletion (they are only actually deleted when the OK button is used to exit the costing data window).