Thanks for the answer, If I understand correctly, you're saying that when 6. was pasted, the hidden bookmark stayed with 2. (and before the text of old 6.) and didn't move down to 3. (with what was 2.)?

The weird thing is that I cut and pasted many times from lines 1. - 5. and it seemed to work without problems. Which makes me think that 6. (which doesn't have a hidden bookmark) when I moved it to position 2. could have messed up Word. But I can't think of a logical reason for it to work like that. (update: I tried more pasting in the manner mentioned and Word did make a complete mess of things with xref or not)

Now the big question, What options should be used (paragraph, no context, full context) and is there a way to cut and paste without Word making a mess of my document? Because many numbered items in my list don't have xrefs (or whatever other problem is hidden) and I can't keep figuring out What word did to my dozens of xrefs. Is there a trick to insert outside the hidden bookmark?

As I said earlier, this was a problem with word 20 years ago. How the F#@$ can it still be a problem?