Contacts on CRM

Hi,

I'm using CRM for Higher Education. I want to create two separate contact groups within the Sales and Marketing panels at the top of the screen - one will be contacts who are Companies and the other contacts will be Students.

How do I only show Student Contacts under the Sales section and the Companies under the Marketing section? In other words I don't want Contacts to contain every contact I have. I want them split into two different groups.

Thanks