Importing a Subclass change

I would like to know if there is any way to import a subclass change on a group of parts. Importing is a powerful tool that we use all the time. Sometimes we change our minds about how we want to subclass parts. The parts are already in the system and associated with an existing subclass. Now we want to change the subclass to something else but there is no requirement to change the part number. We dont care about losing page 3 information either because we can capture that and import that to a new page 3 for the new subclass. It