If using Turbotax online, it is recommended to create a new account, and manually type in any information that needs to be carried over. It is very difficult to remove the former spouse completely from the tax file, because they may be listed on internal worksheets that are not accessible or editable by the user.
If using Turbotax installed on your own computer, you might have more success by importing the old data file and deleting the former spouse, because you will be able to directly few and edit all the program worksheets. However, it is still recommended to start from scratch.
