I think I asked the question incorrectly... I can group resources, what I'm hoping to do is.... In the "Resource Name" column is create a tree(?) To the effect that I click a cell (in the Resource Name column), the group names appears (Production, Maintenance etc.) then click a group name and a drop down list shows names of the personnel in that group. Then select the name to assign task. I'm trying to avoid the very long list of personnel and equipment.

Resource
Name (column)

+Production (group)
+Maintenance (group)
John J
Steve S
Don J
+Electrical (group)
+Mechanical (group)
+Contractor (group)
+Equipment (group)

rtuttle