The "Collection Columns" is a list of columns in the calibre library. The values in those columns are used as the collection names and the books will be put into those collections. You can use one or more columns and they can be of any type.
Common choices are:
- "tags" - all the tags you have for the books will be used as the collection names.
- "series" - put the books into a collection for the series the books are in.
- "tags, series" - both of the above.
Your custom column should work. You probably need to have the "Create Collections" options selected. Then, the most common mistake is not to set the "Metadata management" option to automatic. This is on the "Sending books to devices" page of the calibre preferences.
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