[AlanHK]

Sometimes I have a group of ebook files that I want to put all in a consistent style, though they came from different sources.

So I just do them one by one (or with two open at once) and do a lot of cut and pasting between the css files, etc.

Is there a way to edit several books at once?
E.g. combining them into one file, editing and and then splitting them again without having to rebuild all the structure?

I have one omnibus ebook (combining 20 books) that if I open it as a zip, I can see each book is a separate folder. But opening it in Sigil, it doesn't show the subfolders, all the files are listed together, and it's impossible to make sense of. Nevertheless, it works in ebook readers.