Globally Replace Tag Directories?

[Nancy Allison]

Hi, folks. The large, many-chaptered document I am working on is the 
product of several past writers' work. The Paragraph and Character tag 
directories are full of tags that are not used in this doc. I'd love to 
clean them all up at once.

I know I can set up one chapter with just the tags I need. Then I can go 
into each chapter,  manually delete all tags, and save the chapter. From 
the Book file, I can then import all tags from my one good chapter into 
all the other chapters.

But . . . I don't want to! Too much work!

If I just import the good tags into the existing chapters, they'll be 
added to the existing tags. Not a solution.

Is there a way to replicate my good tags in all the other chapters, 
globally?

Thankee again, in advance again.