MeeKeee,
Each record will ask user if they want to enter data as US Standard or Metric. If they choose Metric, then I want the database to canvert the metric number to us standard and save results into new field as weight_lbs. This needs to be done for Langth, Width and Height as well. The system will convert the MM to Inches and save in length_inches. But some users will be using us standard as input so those numbers will not be converted but simply safe the same amount into weight_lbs or langth_inches. From your other reply sounds like field type list string is not the field type I should have used.