Can you bookmark one post that has a link to something else or does the whole topic get saved ?Does this make sense?

I can't answer your question. But an alternative would be to copy and paste the link into a page you create in My Pages.

When there is a link I might want to go to at a later time, I bookmark the post, but make the title for the saved bookmark whaterver the link is so that I will recognize it at a later time.

the whole topic is book marked

Thanks just what I htought.