v4 or later PDF Guides with bookmarks.

I think I've tried a dozen or so viewers. I've only found 3 viewers that allow you to make bookmarks:

The linux version of foxit, but it doesn't allow you to make indented bookmarks/child bookmarks so I discarded it.

master pdf editor: cross platform but not fully free. It can create intended bookmarks. Their website says the free version adds watermarks to output files, so after I added some bookmarks I expected the resulting file to have unsightly watermarks on every page. This was not the case, so maybe just adding bookmarks doesn't trigger the watermarks limitation.

And Pedro's suggestion: I downloaded jpdfbookmarks and it works well. The text selection mode is a bit... different, but I can get used to it.
What I haven't been able to do is use the clickable index to quickly go to where the chapters and different sections start.
Do you by chance know how to this Pedro?

Edwar Cifuentes wrote

What I haven't been able to do is use the clickable index to quickly go
to where the chapters and different sections start.
Do you by chance know how to this Pedro?

The clickable index works as expected in any viewer. The jpdfbookmarks
program is only supposed to be used to add bookmarks. If after adding the
bookmarks the index is not working in your PDF viewer as expected then it is
a bug. You can submit the bug to the jpdfbookmarks developers (but as I
mentioned it seems to be abandoned) or fix it yourself (if you know how to
code)

Alternatively you could try to run PDF X-Change Editor under Linux using
Wine (I am just an occasional Linux user so I have no idea how well this
works)

If that works then you can try something even faster: export the bookmarks
from the Calc 3.4 Guide and import it to the Calc 4.1 Since the manuals
should not be that different, you can have a perfect Calc 4.1 guide within a
few hours.

Disclaimer: I am no way affiliated with the authors of PDF X-Change Editor,
I'm just a happy user of a great free (but not open source) program (that
unfortunately is only available for the Windows platform)