Project template can contain only one set of file import settings per one file type.
Available workaround (if any):
Using a Custom file type feature. Another settings for a file type can be applied as long as it is with either XML, JSON, HTML or Multilingual XML file import settings.
Project template can have two or more different settings for the same file type. The settings would be applied according to the user’s conditions.
The user receives repeatably batches of Multilingual MS Excel files and some of them differ in column structure. The user would prefer to have one project and one project template, so the process can be still automatic without any need to manually tweak the settings every time.