1. ServiceNow Product Documentation (Utah): Dynamic CI groups. "A dynamic CI group is a CI group that is populated with CIs by a CMDB group query... The query runs against a target CMDB class and its child classes
and the CIs that the query returns become members of the CI group." This directly describes the functionality needed to group all web servers in Miami.
2. ServiceNow Product Documentation (Utah): Create a dynamic CI group. The procedure outlines the steps: "Navigate to Configuration > CI Groups. Click New. On the form
fill in the fields. In the Type field
select Dynamic CI Group. In the CI filter field
create the filter to use for the query that populates the group." This confirms the mechanism for creating such a group.