[MarjaE]

Right now, the best I've been able to do has one site writing subject tags to tags, and another writing categories to #notes. So I don't want them to overwrite my ~~existing~~ formerly existing metadata, and I do want them to add to the same column. Either column would be fine, as long as it doesn't overwrite and it does add to the same column.

Is there a way to do this?

P.S. As a stop-gap, I've tried

custom_columns_settings:
# cliches=>#acolumn
# themes=>#bcolumn,a
# timeline=>#ccolumn,n
# "FanFiction"=>#collection
# averrating=>#averrating,r_anthaver
category=>#notes,a

But I still have to check "New Only" or it overwrites other notes. "New Only" is a bit of a confusing name, since it seems to suggest either (a) overwriting existing notes, keeping only the new ones, or (b) only adding notres to new books.