Some tables in your application may have a logical relationship to each other. For example, invoice information is often divided into two tables. One table contains the header information for each invoice, while the other table contains the line items for the invoice. These two tables have an inherent relationship; each table requires the other.
Often it is useful to work with related tables as a group. For example, when you use security in your application to set access for a table, you will want to set the same security access for all related tables. Dexterity allows you to create a table group. A table group allows you to group logically related tables under a single name. Refer to Table Groups for information about creating table groups.