I need to create unique IDs for all of my stock. I would like to use the concatenate function so that the first letter of each products type is taken and then joined onto a unique number. Im not sure how I will do this I was thinking that the formula looks at the largest value and adds 1 so that there are no duplicate numbers added to the first letter of the product type. E.g. the first mother board added will be "M1" the next will be "M2" as the formula has found that M1 exists and has added 1. If someone could help with this i would be very grateful thank you.