I was trying very hard to figure out how to change category of multiple references at the same time. But I failed, I selected multiple references, right clicked, chose categorize, then checked another category, but nothing happened.
Then I tried select and drag, it worked, but the problem is how could I remove those references from the old category?
Thanks!
Alternative way
I tried the drag and drop method, still not work for me. But I figured out another way to solve it. Like there is a category named Medicine, and I want to remove all the references carry this category, just open the replace dialog under edit menu, then find with "Medicine; ", replace with "", then remember to restrict field to "Categories". That it! I don't know if this will cause any side effect, but for me it worked.
The trick is to retrieve
The trick is to retrieve references first by clicking on the category. Then drop references to it.
To remove a category with
To remove a category with drag and drop: First, click a category on the right to retrieve all the records that are tagged with it. Then select a few records and drop drop to the category.