Set up Giving Number Reassignment
Set up a pending reassignment and print a CSV of your giving numbers.
You must be an administrator to do this. Create a custom query that contains the profiles you want to reassign numbers for.
Note: If you refer to giving numbers by a different name and have made changes to reflect it, that name will replace "Giving Numbers" everywhere. For more information on how to customize this, see Customize Existing Profile Fields.