Designating Duplicate Barcodes in a new column
Hello, I have a data set that contains duplicate barcodes that I would like to have designated based on run date. For example, my data set has originals, repeat 1, and repeat 2 barcodes. I can tell that they are specific repeats based on the date of the run. I have attached an example photo here for reference. I have no problem identifying the duplicate rows but I am struggling to find a good way ...