You should create your own extension file to organize your extensions to the delivered schema.
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Open the SmartPlant Schema Editor without opening any existing configuration or schema files.
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Click File > New > Schema File.
You can also click the New button above the Schema File button in the Workflows dialog box to create a schema extensions file.
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In the New Schema File dialog box, define the name and location for your schema extension file, and then click Save.
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Save your extension file to the same folder as the delivered schema files on which you want to create your extensions.
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To use your user-defined extensions file, you must link it to the SmartPlant schema using dependencies and a configuration file. For more information about setting dependencies and creating a configuration file for using your extension file, see Add a new schema file to a configuration file.