Use the organisation mode to view your contacts by their company name as shown below: 

Search for a company and open up the company contact record to view individual people at the company as shown below: 

By using the Clone button as shown below in red, you can create another contact to be stored underneath the 'company' record:

This will bring up a pop up window 'Copy as new contact' as shown below: 

Please add in the details of the new contact you want to create.  If they are based at a different address add their address into the address fields as well as their contact information as shown below: 

Use the 'Division' field to enter their location as shown above in red.  

Click on 'Copy' as shown above in red to create the new contact at the company. 

By looking at the company view you will now see your individual contacts listed at different locations as shown below: