A method, user interface, and computer-readable medium to receive a representation of a first query item, the first query item belonging to a data set and having at least one attribute; receive a representation of a second query item, the second query item being defined as relating to at least one particular attribute of another query item; associate the second query item with the first query item; automatically retrieve, in response to the second query item being associated with the first query item, a value for the at least one particular attribute of the second query item from the first query item; and save a record of the retrieved value.