For easier management and a better overview, you can organize your team members into different teams. Please go to the Users > Teams tab to arrange this.
View reports by Team
After creating Teams you will be able to filter all of your reports by Team instead of just by User:
Limit the access of Managers to their Team only
When assigning roles to your members, you will be able to select that the Manager is only able to view the time logs for members of their team/teams:
This way you can prevent the Manager from accessing the time logs of members who are working on the same project but are not on the same team as the Manager.
Approving time logs by Teams
If you are using the Approval Workflow, assigning members to Teams will also be very useful. In this case, the managers with permission to approve logs will get email notifications only when time logs from their team are submitted for approval (only for manual submissions).
When setting up permissions for the Manager, select 'Can view time logs of assigned teams only' to achieve this (see the screenshot above).