The User Library allows you to configure a component from the Schematic Library, then place it in the User Library for use in the current or other designs - it is not design specific.
You can configure the same kind of component in a different way, and add it to the Library giving you two variations of the same component.
Simply select the component you want, and drag it into the Schematic as you would from the Schematic Library.
Select the component you want to delete, and press the Delete Key, or click the - (minus sign) in the User Library heading.
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