Quote:
Originally Posted by paul55391
Thanks, responders. I created a column of type Integer and now I can use this field to assign books to one or more virtual libraries.
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Sometimes it is good to know to what virtual lib a book is linked (if a book is part of more than one virtual library). In this case this is maybe useful for you too:
Create a custom column build from other column and use the template function
{0:'virtual_libraries()'}