[dunhill]

I'm helping a school manage their library with Calibre, as I mentioned in another thread.
Like everyone who isn't familiar with Calibre, they used an Excel spreadsheet. And they wanted to maintain its structure. They had a column for the book's subject. I initially suggested they use the labels column for that data. They said no, so I converted their Excel spreadsheet to a CVS file and imported it with the settings they requested. Now they're asking if it's possible to convert the data from the subject column to tags. Could someone tell me how to convert it? I tried importing the CVS file by changing the header for that column to tags, but the result changed some things instead of adding them. That's why I'm asking for your help.