Has anyone found a way to simply attach all leads to a company?

I have 44000 leads for 2400 companies I need to assign to 3 reps. Since you cannot tell ZOHO to attach ALL leads to a company and then assign them it looks like you have to enter company in the search area under leads then assign them... HOURS and DAYS of work. With Salesforce this is not the case. You can attach a lead to a company with ease. 

I am lost on what the thinking is. I have had ZOHO Service team members agree.  ( I see you can as attach a contact to company but these are not contacts yet, they are still leads we are just starting to email and call.

Thank you and I am sure others have the same issue. 

Evan