Hi, you can filter VMs by folder. There are attributes vm.folder.name, vm.folder.level-1, vm.folder.level-2,.... up to level 10. Use advance search to find them.
Each admin can create his own dashboard and show just VMs he is interested in. For segmentation of alerts I propose to create a copy of needed alert and use folder atributes in the search to filter required subset. Admins can use tags to filter their content (alerts, trends, ...).