A datasheet that is nested within another datasheet and that contains data related or joined to the first datasheet. You can add subdatasheets to a table or query in a Microsoft Access database, or a form by using a subform in an Access database or Microsoft Access project. For example, if a Suppliers table has a one-to-many relationship with a Products table; then for each row of the Suppliers table in Datasheet view, you can view and edit the related rows of the Products table in a subdatasheet.