Importing partial data not working

Importing partial data not working

Hello. I have a form (table) with many columns, but want to import only data in to the CompanyName column (at the moment). I pasted text in to the form while giving the same field name, and new records showed up, but nothing was in them. So, why is this not working? And in general, how can I import (populate) only part of the fields in my form? Thanks.