Child datasets can be added to root datasets to narrow down the search. Datasets are collections of events that
represent your data in a structured and hierarchical way. Datasets can be created by using commands such as
datamodel or pivot. Datasets can have different types, such as events, search, transaction, etc. Datasets can
also have different levels, such as root or child. Root datasets are base datasets that contain all events from a
data model or an index. Child datasets are derived datasets that contain a subset of events from a parent dataset
based on some constraints, such as search terms, fields, time range, etc. Child datasets can be added to root
datasets to narrow down the search and filter out irrelevant events.