Use LookupSet to retrieve a set of values from the specified dataset for a name-value pair where there is a 1-to-many relationship. ...

Use LookupSet to retrieve a set of values from the specified dataset for a name-value pair where there is a 1-to-many relationship. For example, for a customer identifier in a table, you can use LookupSet to retrieve all the associated phone numbers for that customer from a dataset that is not bound to the data region.