Or if you already have multiple established libraries that you want to have the same columns you can use the Copy To Library option.
In the library with the columns you want to duplicate, right-click on a book, go to Copy To Library, then choose the library you want to duplicate the columns in. Calibre will then ask you if you want to copy over columns that do not exist in the destination library. You can select which ones you want and Calibre will create those columns in the destination library. You can then go into the destination library and delete the copy of the book you just duplicated. The columns will remain.
*Do not select the Delete After Copy option unless you want to actually move the book and not just duplicate it temporarily.
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