[SkookumPete]

I must say I'm baffled by the way Sigil deals with multiple files. After adding several existing files I found that Sigil had stripped the (relative) paths from all the hrefs, so that the links were broken. Having fixed those with S&R, I now find that links to pathless #anchors in the same file don't work.

Re importing linked files: the way I'm used to doing this in Calibre is to create a book file that contains nothing but links to the various source files. It's very easy to re-create the book by simply opening this file.