What data users can see in reports depends on their roles and permissions, and on whether hierarchy filtering is enabled in your system. These limitations exist for security reasons, to help keep confidential data private. Refer to How Hierarchy Filtering and Permissions affect Report Data Visibility in Web TimeSheet's online help for more information on this. However, you can easily allow any user to view all report data. Remember that this will allow the user to see data for all employees, including cost and payroll data.
As an alternative to creating a new permission profile, you could add the permission to an existing profile. However, if you do this, be sure the profile is only assigned to users you want viewing all report data.