[otrs] Customer unable to view other tickets for same Company

Apologies if this is a simple question - I'm new to OTRS. When a customer logs in to the customer interface, they can click the Company Tickets button to see tickets raised by others in their company. If the user clicks on the ticket raised by another, he/she gets a No Permission message. Is there any way of making it possible for all users within the Company to view (and hopefully add notes against) tickets raised by others within their company? Thanks in advance!