How to mass update expense type name, description, itemization

We have several expense templates, each containing about 800 expense types and we have 11 active business units.

We would need to update the name and description of the expense types and can find the export/import function on the menu, however it does not seem to work for updating the values, only importing new ones.

Please advise if there are other options to update the expense types.

Navigation path: setup and maintenance > manage expense report templates > find the template > edit the expense type name and description