[DemeRain]

I’ve got two large but separate libraries. I plan to combine them into one. I’d like label all the stories as either read or unread before I combine the respective libraries. But I don’t want to do them individually. Is there a short cut that can change all the items in a column in bulk?

My custom columns are either yes/no only.
Or have text, but with a fixed set of permitted values.
Refer to the screenshot attached.

Keep in mind if offering an answer, I'm tech literate, but am by no means a programer.