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One way to do it:
1) Create a custom column "made from other columns". Use {id} as the template.
2) Create a user category in the tag browser. This will be the name of the collection.
Then for each book you want to put in the collection.
3) click on the book line to select the book. Select more than one book if you wish.
4) click/drag the cell showing the custom column you created in step 1 to the category you created in step 2. Do not drag some other column.
You now have a user category containing the ids of the books you dragged to it. Clicking on that category will search for books with those IDs.
This technique won't be terribly speedy if you put hundreds of books into a category. Reason: the search must test each book in your library against each id in the category.
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