One Parent Record Type to One Child Record Type
In a one record type to another record type parent-child association, you have one field on a child record with Record is Parent checked. When the Record is Parent box is checked on the child record, a child record sublist is automatically added to the parent record. Therefore, the parent record has one sublist to which it can associate with one or more child record instances. These record instances all are of the same record type. The records can be custom or standard.
For more information, see the following topics: