You can delete an object from a diagram.
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Select the object symbol in the diagram and press the del key.
or
Right-click the object symbol in the diagram and select from the contextual menu.
The Confirm Deletion dialog box is displayed. Note that if you delete a free symbol, such as free text, a line or a shape, no confirmation is required.

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[optional] Click the Impact button to evaluate the impact of the deletion (see Impact and Lineage Analysis).
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Choose one of the following delete options:
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Delete objects – deletes the object, with all its properties and sub-objects from the model
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Delete symbols only – deletes the object symbol from the diagram, but leaves the object available in the model for future use
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Click OK.
The object (or only its symbol) is deleted from the model.