Use MasterSource to indicate the dataset that serves as a master table when establishing a master/detail relationship. Specify a TDataSource component whose DataSet property identifies the desired master dataset. 

A master/detail relationship is established when you set the MasterSource property to identify a master dataset, the MasterFields property to identify the fields in that master dataset whose values must be matched by linking fields in this (detail) SQL table, and the IndexName or IndexFieldNames property to identify the linking fields in this SQL table.  

MasterSource is the same as the DataSource property, except that it is published. 

IndexFieldNames 

IndexName 

MasterFields 

DataSource 

DataSet 

Making the Table a Detail of Another Dataset 

Setting Up Master/detail Linked Cursors