[JimmXinu]

Originally Posted by ownedbycats

Thanks.

Question: I have this:
...
(replace_metadata is easier, but also affects custom category columns and the title pages).

Since I have downloading of other tags disabled, I thought that this would take the category, turn it to a tag, and then turn it into Fanfiction.Category. Did I go about this the wrong way?

You have extratags instead of category in the add_to_replace_metadata and appear to be missing the necessary leading space.

include_subject_tags: category
add_to_replace_metadata:
 category=>^(.*)$=>Fanfiction.\1