Characteristics of resource groups
A resource group is just a way to organize several resources together, so it doesn't have a lot of the same characteristics as an individual resource, like Efficiency and Cost.
Name: Of course, a resource group has its own name.
Address: You can assign an e-mail address to a group, in case you have a mailing list or some address which goes to all of the members in the group.
Type: A resource group can contain resources of any type (
Staff, 
Equipment, or 
Material), but its own type is always 
Group.
Staff, Equipment, or Material), but its own type is always Group. Cost/Use, Cost/Hour, and Efficiency: These are shown as averages of the values of all members of the group. If you enter a new value, it is applied to all members of the group.