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According to the on-board help regarding Relationships:
Identifying: Controls whether this is an identifying relationship. When there is an identifying relationship between a parent entity and a child entity, when the relational model is generated, the following occurs in the child table: the foreign key to the parent becomes part of the primary key of the child. (In non-identifying relationships, the foreign key to the parent table is just another column in the child table and is not part of the primary key.)
Pressing F1 while in a dialog box will display the available Help for that dialog box, as seen in the image below.
hope this helps
Thank you Dave !!!