Okay, so this example works for elements on shared levels and grids workset.
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My group of nodes that “Filter Out Non Model Elements” removes elements on the workset that don’t really have a category.
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It then groups the selected elements by their category.
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There is a category query that looks in the list of “Unique Keys” and gets the index of that category if it is a valid category in the output.
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From there, you can determine the new workset you want it to go on.
