I need to send out two seperate emails. One from company A One from company B All contacts are in the data base but are not seperated. How can I take the current contacts and seperate them so that I can send out a different email to company read more

I am trying to import a spreadsheet with the company name and address but we do not have a contact name, it is not letting me do so. Is first name and last name required in order to import contacts