The Create popup menu contains the following commands:
Entity enables you to create an Entity in an Entity-Relationship Diagram. If prompting is switched "on" for Entities you are prompted to name the Entity. Alternatively, if prompting is "off" you can name the Entity later using the Alter command from the Entity pop-up menu.
Weak Entity enables you to create a Weak Entity in an Entity-Relationship Diagram. If prompting is switched "on" for Entities you are prompted to name the Entity. Alternatively, if prompting is "off" you can name the Entity later using the Alter command from the Weak Entity pop-up menu.
Relationship enables you to create an Relationship in an Entity-Relationship Diagram. If prompting is switched "on" for Relationships you are prompted to name the Relationship. Alternatively, if prompting is "off" you can name it later using the Alter command from the Relationship pop-up menu.
IS_A Relationship enables you to create an IS_A Relationship in an Entity-Relationship Diagram.
Text enables you to create a textual comment in a diagram. This comment is text that is not directly related to a diagram component.