If you have a master carrier account, you can create Roles to limit access to the different areas inside the portal. 

As an example, let’s say you want to provide access to a group of mechanics who take care of your fleet and DVIR defects. You don’t want this type of user to be able to see Logbooks, unidentified logs, violations, IFTA, and such information. You can create a new role to assign them to, disable all unnecessary features, and assign DVIR access only. Do not forget to click Save.