I have a database of several thousand assets, each with a unique number. From a much smaller list of, say, 50 assets, each with a number, (below the main data), I would like to be able to color the cells in the main database corresponding to these 50 assets, thus marking the main database. However, and this may be tricky, I would like to be able to either STOP this process or message me if the asset in the main database has already been marked (cell colored). I would assume that VBA would have to be used for this?? Thanks in advance, SJK.