Resource crews allow dispatchers to search and schedule multiple resources at once. Resource crews can include a group of employees, subcontractors, equipment, facilities, or any combination thereof who will perform the same work during a period of time. Crews speed up and simplify the scheduling process and allow team members to work together more consistently.
Reference:
https://learn.microsoft.com/en-us/dynamics365/field-service/resource-crews
https://learn.microsoft.com/en-us/dynamics365/field-service/set-up-bookable-resources