See Entity definition
here.
 Local
List of all entities instanciated into the current scenario.
Multiple selection is available using keyboard Shift and Ctrl keys.
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 Instanciate
Copy/paste the selected entity from the Available or Catalog list to the current scenario.
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 Add
Add one entity from the template list.
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 Property
Call the property window of the list selected entity.
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 Make Catalog
Copy the selected entity/entities to the Catalog list.
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 Delete
Delete the selected entity/entities.
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 Available
List of all entities available in the other scenarios (in parenthesis) that can be copied into this one.
Select any of them and use the  button.
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 Catalog
List of all entities available in the Catalog that can be copied into this one.
Select any of them and use the  button.
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