Hello, I'm hoping some experts on here can help me. I have a very large sheet with like items grouped together. I'd like to number all the different cells, but only number the first cell of like items. I've attached an image of how I'd like it numbered. I can't use the "counta if isblank" formula because I need to track the actual number of different items I have on the list. I'm using Excel for Mac and don't have any addins other that what was packaged with this software. Any help is appreciated.