Setting up a check box

[Howardc]

I would like to set up a check check box in Col A, which is in the column next to the account numbers to ensure that all the account numbers have been mapped i.e being taken into account. A trial balance is imported into my management accounts workbook each month and if any new account numbers have been added, I will be able to pick this up immediately by having a check box to see if there are any new account numbers

Your assistance in setting this up is most appreciated