How to create category of leads within an organization

How to create category of leads within an organization

Hello,

I am in the process of importing contacts into the Zoho system. I was hoping to find a way to organize my contacts by organization. That is some organization have 3-5 contacts and I occasionally would want to send those contacts an email at once. 

Is there an easy way to "group" contacts into buckets of sorts that belong to the same organization?

Thanks so much!