Currently the option to import Business Information on the Contact Card is limited to the Current Business only. It would be great to add the "Currently Employed" field to the import so that current as well as past businesses can be imported. The "employment_end" column is already present in the import layout.
If Currently Employed field was added, it would be great if we could also change Yes to No on existing business records. I will add a new idea specifically for updating existing business information, but thought a note here may be good too.