Group Maintenance is to define the security group that the user belong to. Group Maintenance is optional.
To create a new user group, go to System Manager ⇒ Group Maintenance, click Add button
and assign which users below to this group in the Users tab.
Individual Company Permissions is to allow single User ID have different access permissions in different company (database).
When assigning groups to user, either all groups are set Individual Company Permissions to different companies or all groups are set to N/A. The purpose of Individual Company Permission to set the permission of a particular company. If mixed the group without Individual Company Permission, the effective rights granted across the companies, that violate the purpose of Individual Company Permission.