It would be quite reasonable if this turns out to be an impossible
request, but I'll give it a try.

I have a manuscript that went out for review. Many of the reviewers'
comments are referenced to line numbers in the original document. As I
make changes, of course, the line numbers change, which gets to be
frustrating. I'm wondering if there is any way to preserve the old
line numbers (perhaps as deleted text in "Track Changes" or as
comments) so that I can see them.

I'm currently just using a hard copy of the document as a reference,
which is certainly a serviceable alternative, but if anyone has a
different solution, I'd be interested to hear it.

thanks,
mike