Duplicating tables in the relationships graph
You can duplicate tables, groups of tables, and any direct relationships among them. Any options you have set for the relationship (for example, a cascading delete) are also duplicated.
To duplicate tables and direct relationships:
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For more information, see Working with the relationships graph.
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Notes
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Duplication preserves the relative positions between the original tables. By default the duplicated tables are placed below and to the right of the original tables.
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Related topics 
About relationships
About the relationships graph
Relationships graph keyboard shortcuts (Windows)
Relationships graph keyboard shortcuts (Mac OS)