I have an Excel file with over 11,000 rows of data. Column A (See Exemplar File) is the primary identifier ID number. The problem is that there are multiples of many of this primary ID due to use in multiple locations (see column I & J.) I need a formula or method to number the 1st, 2nd, 3rd, etc. occurrence of each primary ID number (see column B.) This way I can sort & filter the file so only the 1st of each ID number is showing. I ultimately need to perform a vlookup from another data set where all the primary ID’s are combined. I want to only pull in the data to the first occurrence of each primary ID number. I greatly appreciate your assistance.