Column built from tags

[palindrome-fox]

Hi all,

I apologise if this has been discussed but I couldn't find a post or thread that described my exact issue and how to solve it.

I'm looking to send my books from calibre to my kobo clara (running koreader)

When sending books to my device I'd like to separate them into a folder structure like:
Author_sort/Genre/Series/Title - Author
(I assume I can do this with a template in my 'send to device' preferences)

The problem is that I'm trying to build a 'Genre' column populated from a tags column (the tags column is mainly built automatically from my fanficfare ini). Unfortunately I'm not too sure how to accomplish this.

I found a bit of code to use when populating the genre column:

program: contains(field('tags'),'Foo','Yes','')

However I don't want a yes/no column result. Ideally it would show a list of my tags eg. Humor, Angst etc. (I would also need to rename these in the template because the original tags are nested eg. Genre.Humor, Genre.Angst etc)

I know very little about how to use calibre templates, although I have spent time reading the wiki trying to figure this out, but no joy.
If someone could help me I'd be really grateful.
Thank you