I'm creating a spreadsheet and want to have it automatically fill in a date of expiry which is a year on from the start date. I have a formula in place to do this, but I want the formula to be ready in that column for any new date which is entered, as new data will be entered on a regular basis. I've copied the formula down the entire column, but the empty rows awaiting new data now have a random date in the expiry column, which will presumably change to the correct date once a start date is entered, but looks very confusing now. How can I change it so that the cells have the formula preprogrammed but look empty until the row is filled in?