The treatment types would be what you had used for the separate fields before. You had a table named TreatmentDates. The fields for those dates were: Positive Date Pre-Treat Treat Final Inspection. I really could not figure out what words went with other words to be the names of your fields. That is, Positive, Date, Pre-Treat, Treat, Final, Inspection or Positive Date, Pre-Treat Treat, Final Inspection, or ???? But, from the name of the table, I had the idea that you had different types of treatments you do. But if you only have one type of treatment, just different dates in regard to that treatment, and the Positive, based on your last response, sounds like it is the outcome of your testing, and if Positive is True, then you do a treatment. From not knowing the business, it is very difficult to try to figure out what your table names and field names are and mean.