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Press F8 to open the Reference Explorer.
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Right-click Hook-Up Item Libraries and then, on the shortcut menu, click New > Item Library.
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On the Item Library Properties dialog box, under Item library, type Item Library 1, and then, click OK.
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Create another library Item Library 2.
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In the Reference Explorer, right-click Item Library 1 and then, on the shortcut menu, click Actions > Set as Active Item Library.
In the Reference Explorer, the libraries should now appear as shown (note the differences between the library icons):
It is also possible to define a library as the active item library on the fly, by selecting the Hook-Up Item Libraries folder and using the New > Active Item Library command on the shortcut menu. You can only set one specific item library as the active item library for your plant.