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I'm not sure if I explained it OK.
This is what I have: a custom column, called My Shelves with a lookup name myshelves.
In this column field I can choose from a number of categories, which I put there myself (though I can't remember for the life of me how I've done that): Medieval, Literature, Miscellaneous etc.
Now I want to add a category to that list, e.g. Roman history. And that's where I'm stumped.
If only I could remember how I made those categories in the first place I would probably be able to figure it out. But that was a few years ago when I got a new PC and had to reinstall Calibre.
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