Not Overwrite Last Name

Not Overwrite Last Name

I need to upload some contacts to Zoho CRM which already have a last name in the system but in the file I'm trying to upload some of the contacts don't have the last name, so I've added the "-" in the last name field. My question is if there is any way to create a rule or something to not overwrite the last name if already has a different field than "-"?

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