My contacts are not listed under my companies

My contacts are not listed under my companies

Hello,
I created a custom field called company when I imported my 60,000+ contacts and so they did not go into the "companies name" field. Now when I click on a company under the companies tab, there are no contacts associated with any contacts. Is there a way to fix this without having to manually enter the "companies name" in all 60,000 contacts? I need "company" to equal "companies name" in the contact view. Please Help!